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Finding the Fourth Proportional to 91,036.64, 136,554.96 and 28,712

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Solution

The fourth proportional to 91,036.64, 136,554.96 and 28,712 is: 43,068

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,036.64 : 136,554.96 = 28,712 : x
  2. Step 2: Convert to fraction form
    91,036.64/136,554.96 = 28,712/x
  3. Step 3: Cross multiply
    91,036.64x = 136,554.96 × 28,712
  4. Step 4: Simplify right side
    91,036.64x = 3,920,766,011.52
  5. Step 5: Solve for x
    x = 3,920,766,011.52/91,036.64
  6. Step 6: Final answer
    x = 43,068

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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.