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Finding the Fourth Proportional to 1,089.60, 1,502.52 and 1,065.76

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Solution

The fourth proportional to 1,089.60, 1,502.52 and 1,065.76 is: 1,469.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.60 : 1,502.52 = 1,065.76 : x
  2. Step 2: Convert to fraction form
    1,089.60/1,502.52 = 1,065.76/x
  3. Step 3: Cross multiply
    1,089.60x = 1,502.52 × 1,065.76
  4. Step 4: Simplify right side
    1,089.60x = 1,601,325.72
  5. Step 5: Solve for x
    x = 1,601,325.72/1,089.60
  6. Step 6: Final answer
    x = 1,469.65

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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.