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Finding the Fourth Proportional to 1,088.72, 1,630.95 and 869.79

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Solution

The fourth proportional to 1,088.72, 1,630.95 and 869.79 is: 1,302.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.72 : 1,630.95 = 869.79 : x
  2. Step 2: Convert to fraction form
    1,088.72/1,630.95 = 869.79/x
  3. Step 3: Cross multiply
    1,088.72x = 1,630.95 × 869.79
  4. Step 4: Simplify right side
    1,088.72x = 1,418,579.65
  5. Step 5: Solve for x
    x = 1,418,579.65/1,088.72
  6. Step 6: Final answer
    x = 1,302.99

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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.