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Finding the Fourth Proportional to 916.77, 1,264.92 and 518.44

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Solution

The fourth proportional to 916.77, 1,264.92 and 518.44 is: 715.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.77 : 1,264.92 = 518.44 : x
  2. Step 2: Convert to fraction form
    916.77/1,264.92 = 518.44/x
  3. Step 3: Cross multiply
    916.77x = 1,264.92 × 518.44
  4. Step 4: Simplify right side
    916.77x = 655,776.21
  5. Step 5: Solve for x
    x = 655,776.21/916.77
  6. Step 6: Final answer
    x = 715.32

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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.