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Finding the Fourth Proportional to 92,124.72, 138,005.64 and 85,644.72

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Solution

The fourth proportional to 92,124.72, 138,005.64 and 85,644.72 is: 128,298.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,124.72 : 138,005.64 = 85,644.72 : x
  2. Step 2: Convert to fraction form
    92,124.72/138,005.64 = 85,644.72/x
  3. Step 3: Cross multiply
    92,124.72x = 138,005.64 × 85,644.72
  4. Step 4: Simplify right side
    92,124.72x = 11,819,454,396.22
  5. Step 5: Solve for x
    x = 11,819,454,396.22/92,124.72
  6. Step 6: Final answer
    x = 128,298.40

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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.