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Finding the Fourth Proportional to 215,886.30, 323,829.45 and 66,125.40

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Solution

The fourth proportional to 215,886.30, 323,829.45 and 66,125.40 is: 99,188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,886.30 : 323,829.45 = 66,125.40 : x
  2. Step 2: Convert to fraction form
    215,886.30/323,829.45 = 66,125.40/x
  3. Step 3: Cross multiply
    215,886.30x = 323,829.45 × 66,125.40
  4. Step 4: Simplify right side
    215,886.30x = 21,413,351,913.03
  5. Step 5: Solve for x
    x = 21,413,351,913.03/215,886.30
  6. Step 6: Final answer
    x = 99,188.10

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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.