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Finding the Fourth Proportional to 715,491.45, 987,330.47 and 393,194.61

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Solution

The fourth proportional to 715,491.45, 987,330.47 and 393,194.61 is: 542,582.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,491.45 : 987,330.47 = 393,194.61 : x
  2. Step 2: Convert to fraction form
    715,491.45/987,330.47 = 393,194.61/x
  3. Step 3: Cross multiply
    715,491.45x = 987,330.47 × 393,194.61
  4. Step 4: Simplify right side
    715,491.45x = 388,213,017,126.79
  5. Step 5: Solve for x
    x = 388,213,017,126.79/715,491.45
  6. Step 6: Final answer
    x = 542,582.33

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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.