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Finding the Fourth Proportional to 387,479.82, 534,701.58 and 217,703

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Solution

The fourth proportional to 387,479.82, 534,701.58 and 217,703 is: 300,418.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,479.82 : 534,701.58 = 217,703 : x
  2. Step 2: Convert to fraction form
    387,479.82/534,701.58 = 217,703/x
  3. Step 3: Cross multiply
    387,479.82x = 534,701.58 × 217,703
  4. Step 4: Simplify right side
    387,479.82x = 116,406,138,070.74
  5. Step 5: Solve for x
    x = 116,406,138,070.74/387,479.82
  6. Step 6: Final answer
    x = 300,418.58

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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.