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Finding the Fourth Proportional to 715,417.83, 987,284.46 and 393,128.01

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Solution

The fourth proportional to 715,417.83, 987,284.46 and 393,128.01 is: 542,520.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,417.83 : 987,284.46 = 393,128.01 : x
  2. Step 2: Convert to fraction form
    715,417.83/987,284.46 = 393,128.01/x
  3. Step 3: Cross multiply
    715,417.83x = 987,284.46 × 393,128.01
  4. Step 4: Simplify right side
    715,417.83x = 388,129,176,537.96
  5. Step 5: Solve for x
    x = 388,129,176,537.96/715,417.83
  6. Step 6: Final answer
    x = 542,520.97

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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.