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Finding the Fourth Proportional to 715,215, 987,007.16 and 388,534.08

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Solution

The fourth proportional to 715,215, 987,007.16 and 388,534.08 is: 536,182.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,215 : 987,007.16 = 388,534.08 : x
  2. Step 2: Convert to fraction form
    715,215/987,007.16 = 388,534.08/x
  3. Step 3: Cross multiply
    715,215x = 987,007.16 × 388,534.08
  4. Step 4: Simplify right side
    715,215x = 383,485,918,864.01
  5. Step 5: Solve for x
    x = 383,485,918,864.01/715,215
  6. Step 6: Final answer
    x = 536,182.71

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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.