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Finding the Fourth Proportional to 715,671.47, 987,613.33 and 393,374.67

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Solution

The fourth proportional to 715,671.47, 987,613.33 and 393,374.67 is: 542,849.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,671.47 : 987,613.33 = 393,374.67 : x
  2. Step 2: Convert to fraction form
    715,671.47/987,613.33 = 393,374.67/x
  3. Step 3: Cross multiply
    715,671.47x = 987,613.33 × 393,374.67
  4. Step 4: Simplify right side
    715,671.47x = 388,502,067,776.35
  5. Step 5: Solve for x
    x = 388,502,067,776.35/715,671.47
  6. Step 6: Final answer
    x = 542,849.73

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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.