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Finding the Fourth Proportional to 715,363.47, 987,225.84 and 393,085.13

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Solution

The fourth proportional to 715,363.47, 987,225.84 and 393,085.13 is: 542,470.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,363.47 : 987,225.84 = 393,085.13 : x
  2. Step 2: Convert to fraction form
    715,363.47/987,225.84 = 393,085.13/x
  3. Step 3: Cross multiply
    715,363.47x = 987,225.84 × 393,085.13
  4. Step 4: Simplify right side
    715,363.47x = 388,063,792,719.63
  5. Step 5: Solve for x
    x = 388,063,792,719.63/715,363.47
  6. Step 6: Final answer
    x = 542,470.80

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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.