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Finding the Fourth Proportional to 715,642.79, 987,613.02 and 393,377.40

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Solution

The fourth proportional to 715,642.79, 987,613.02 and 393,377.40 is: 542,875.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,642.79 : 987,613.02 = 393,377.40 : x
  2. Step 2: Convert to fraction form
    715,642.79/987,613.02 = 393,377.40/x
  3. Step 3: Cross multiply
    715,642.79x = 987,613.02 × 393,377.40
  4. Step 4: Simplify right side
    715,642.79x = 388,504,642,013.75
  5. Step 5: Solve for x
    x = 388,504,642,013.75/715,642.79
  6. Step 6: Final answer
    x = 542,875.09

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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.