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Finding the Fourth Proportional to 1,248.72, 1,723.10 and 689.16

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Solution

The fourth proportional to 1,248.72, 1,723.10 and 689.16 is: 950.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.72 : 1,723.10 = 689.16 : x
  2. Step 2: Convert to fraction form
    1,248.72/1,723.10 = 689.16/x
  3. Step 3: Cross multiply
    1,248.72x = 1,723.10 × 689.16
  4. Step 4: Simplify right side
    1,248.72x = 1,187,491.60
  5. Step 5: Solve for x
    x = 1,187,491.60/1,248.72
  6. Step 6: Final answer
    x = 950.97

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1.5x scale

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.