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Finding the Fourth Proportional to 861.59, 1,290.32 and 495.26

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Solution

The fourth proportional to 861.59, 1,290.32 and 495.26 is: 741.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.59 : 1,290.32 = 495.26 : x
  2. Step 2: Convert to fraction form
    861.59/1,290.32 = 495.26/x
  3. Step 3: Cross multiply
    861.59x = 1,290.32 × 495.26
  4. Step 4: Simplify right side
    861.59x = 639,038.67
  5. Step 5: Solve for x
    x = 639,038.67/861.59
  6. Step 6: Final answer
    x = 741.70

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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.