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Finding the Fourth Proportional to 916.53, 1,264.80 and 496.88

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Solution

The fourth proportional to 916.53, 1,264.80 and 496.88 is: 685.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.53 : 1,264.80 = 496.88 : x
  2. Step 2: Convert to fraction form
    916.53/1,264.80 = 496.88/x
  3. Step 3: Cross multiply
    916.53x = 1,264.80 × 496.88
  4. Step 4: Simplify right side
    916.53x = 628,454.11
  5. Step 5: Solve for x
    x = 628,454.11/916.53
  6. Step 6: Final answer
    x = 685.69

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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.