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Finding the Fourth Proportional to 710,985.74, 981,163.78 and 388,695.85

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Solution

The fourth proportional to 710,985.74, 981,163.78 and 388,695.85 is: 536,402.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,985.74 : 981,163.78 = 388,695.85 : x
  2. Step 2: Convert to fraction form
    710,985.74/981,163.78 = 388,695.85/x
  3. Step 3: Cross multiply
    710,985.74x = 981,163.78 × 388,695.85
  4. Step 4: Simplify right side
    710,985.74x = 381,374,288,218.08
  5. Step 5: Solve for x
    x = 381,374,288,218.08/710,985.74
  6. Step 6: Final answer
    x = 536,402.17

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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.