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Finding the Fourth Proportional to 916.12, 1,264.62 and 636.76

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Solution

The fourth proportional to 916.12, 1,264.62 and 636.76 is: 878.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.12 : 1,264.62 = 636.76 : x
  2. Step 2: Convert to fraction form
    916.12/1,264.62 = 636.76/x
  3. Step 3: Cross multiply
    916.12x = 1,264.62 × 636.76
  4. Step 4: Simplify right side
    916.12x = 805,259.43
  5. Step 5: Solve for x
    x = 805,259.43/916.12
  6. Step 6: Final answer
    x = 878.99

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Half scale
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Double scale
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1.5x scale

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.