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Finding the Fourth Proportional to 861,401.88, 1,188,722.70 and 479,428.80

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Solution

The fourth proportional to 861,401.88, 1,188,722.70 and 479,428.80 is: 661,605.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,401.88 : 1,188,722.70 = 479,428.80 : x
  2. Step 2: Convert to fraction form
    861,401.88/1,188,722.70 = 479,428.80/x
  3. Step 3: Cross multiply
    861,401.88x = 1,188,722.70 × 479,428.80
  4. Step 4: Simplify right side
    861,401.88x = 569,907,897,593.76
  5. Step 5: Solve for x
    x = 569,907,897,593.76/861,401.88
  6. Step 6: Final answer
    x = 661,605.12

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.