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Finding the Fourth Proportional to 695.54, 1,038.67 and 655.04

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Solution

The fourth proportional to 695.54, 1,038.67 and 655.04 is: 978.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.54 : 1,038.67 = 655.04 : x
  2. Step 2: Convert to fraction form
    695.54/1,038.67 = 655.04/x
  3. Step 3: Cross multiply
    695.54x = 1,038.67 × 655.04
  4. Step 4: Simplify right side
    695.54x = 680,363.57
  5. Step 5: Solve for x
    x = 680,363.57/695.54
  6. Step 6: Final answer
    x = 978.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.