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Finding the Fourth Proportional to 210,801.87, 316,203.35 and 86,142.87

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Solution

The fourth proportional to 210,801.87, 316,203.35 and 86,142.87 is: 129,214.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,801.87 : 316,203.35 = 86,142.87 : x
  2. Step 2: Convert to fraction form
    210,801.87/316,203.35 = 86,142.87/x
  3. Step 3: Cross multiply
    210,801.87x = 316,203.35 × 86,142.87
  4. Step 4: Simplify right side
    210,801.87x = 27,238,663,641.90
  5. Step 5: Solve for x
    x = 27,238,663,641.90/210,801.87
  6. Step 6: Final answer
    x = 129,214.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.