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Finding the Fourth Proportional to 715,657.68, 987,587.28 and 393,367.68

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Solution

The fourth proportional to 715,657.68, 987,587.28 and 393,367.68 is: 542,836.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,657.68 : 987,587.28 = 393,367.68 : x
  2. Step 2: Convert to fraction form
    715,657.68/987,587.28 = 393,367.68/x
  3. Step 3: Cross multiply
    715,657.68x = 987,587.28 × 393,367.68
  4. Step 4: Simplify right side
    715,657.68x = 388,484,917,131.11
  5. Step 5: Solve for x
    x = 388,484,917,131.11/715,657.68
  6. Step 6: Final answer
    x = 542,836.23

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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.