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Finding the Fourth Proportional to 831,640.40, 1,247,460.60 and 515,070.80

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Solution

The fourth proportional to 831,640.40, 1,247,460.60 and 515,070.80 is: 772,606.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    831,640.40 : 1,247,460.60 = 515,070.80 : x
  2. Step 2: Convert to fraction form
    831,640.40/1,247,460.60 = 515,070.80/x
  3. Step 3: Cross multiply
    831,640.40x = 1,247,460.60 × 515,070.80
  4. Step 4: Simplify right side
    831,640.40x = 642,530,529,210.48
  5. Step 5: Solve for x
    x = 642,530,529,210.48/831,640.40
  6. Step 6: Final answer
    x = 772,606.20

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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.