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Finding the Fourth Proportional to 715,153.47, 986,908.08 and 388,463.86

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Solution

The fourth proportional to 715,153.47, 986,908.08 and 388,463.86 is: 536,078.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,153.47 : 986,908.08 = 388,463.86 : x
  2. Step 2: Convert to fraction form
    715,153.47/986,908.08 = 388,463.86/x
  3. Step 3: Cross multiply
    715,153.47x = 986,908.08 × 388,463.86
  4. Step 4: Simplify right side
    715,153.47x = 383,378,122,221.99
  5. Step 5: Solve for x
    x = 383,378,122,221.99/715,153.47
  6. Step 6: Final answer
    x = 536,078.11

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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.