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Finding the Fourth Proportional to 861.89, 1,292.99 and 368.28

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Solution

The fourth proportional to 861.89, 1,292.99 and 368.28 is: 552.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.89 : 1,292.99 = 368.28 : x
  2. Step 2: Convert to fraction form
    861.89/1,292.99 = 368.28/x
  3. Step 3: Cross multiply
    861.89x = 1,292.99 × 368.28
  4. Step 4: Simplify right side
    861.89x = 476,182.36
  5. Step 5: Solve for x
    x = 476,182.36/861.89
  6. Step 6: Final answer
    x = 552.49

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Double scale
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1.5x scale

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.