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Finding the Fourth Proportional to 910.59, 1,254.87 and 648.15

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Solution

The fourth proportional to 910.59, 1,254.87 and 648.15 is: 893.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.59 : 1,254.87 = 648.15 : x
  2. Step 2: Convert to fraction form
    910.59/1,254.87 = 648.15/x
  3. Step 3: Cross multiply
    910.59x = 1,254.87 × 648.15
  4. Step 4: Simplify right side
    910.59x = 813,344.52
  5. Step 5: Solve for x
    x = 813,344.52/910.59
  6. Step 6: Final answer
    x = 893.20

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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.