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Finding the Fourth Proportional to 831,713.80, 1,247,570.70 and 768,728.20

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Solution

The fourth proportional to 831,713.80, 1,247,570.70 and 768,728.20 is: 1,153,092.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    831,713.80 : 1,247,570.70 = 768,728.20 : x
  2. Step 2: Convert to fraction form
    831,713.80/1,247,570.70 = 768,728.20/x
  3. Step 3: Cross multiply
    831,713.80x = 1,247,570.70 × 768,728.20
  4. Step 4: Simplify right side
    831,713.80x = 959,042,778,583.74
  5. Step 5: Solve for x
    x = 959,042,778,583.74/831,713.80
  6. Step 6: Final answer
    x = 1,153,092.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.