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Finding the Fourth Proportional to 916.59, 1,264.28 and 636.87

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Solution

The fourth proportional to 916.59, 1,264.28 and 636.87 is: 878.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.59 : 1,264.28 = 636.87 : x
  2. Step 2: Convert to fraction form
    916.59/1,264.28 = 636.87/x
  3. Step 3: Cross multiply
    916.59x = 1,264.28 × 636.87
  4. Step 4: Simplify right side
    916.59x = 805,178.82
  5. Step 5: Solve for x
    x = 805,178.82/916.59
  6. Step 6: Final answer
    x = 878.45

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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.