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Finding the Fourth Proportional to 831,707.80, 1,247,561.70 and 660,465.70

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Solution

The fourth proportional to 831,707.80, 1,247,561.70 and 660,465.70 is: 990,698.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    831,707.80 : 1,247,561.70 = 660,465.70 : x
  2. Step 2: Convert to fraction form
    831,707.80/1,247,561.70 = 660,465.70/x
  3. Step 3: Cross multiply
    831,707.80x = 1,247,561.70 × 660,465.70
  4. Step 4: Simplify right side
    831,707.80x = 823,971,711,483.69
  5. Step 5: Solve for x
    x = 823,971,711,483.69/831,707.80
  6. Step 6: Final answer
    x = 990,698.55

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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.