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Finding the Fourth Proportional to 715,686.90, 987,636.84 and 393,390.08

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Solution

The fourth proportional to 715,686.90, 987,636.84 and 393,390.08 is: 542,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,686.90 : 987,636.84 = 393,390.08 : x
  2. Step 2: Convert to fraction form
    715,686.90/987,636.84 = 393,390.08/x
  3. Step 3: Cross multiply
    715,686.90x = 987,636.84 × 393,390.08
  4. Step 4: Simplify right side
    715,686.90x = 388,526,530,560.36
  5. Step 5: Solve for x
    x = 388,526,530,560.36/715,686.90
  6. Step 6: Final answer
    x = 542,872.21

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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.