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Finding the Fourth Proportional to 671.16, 1,005.51 and 613.24

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Solution

The fourth proportional to 671.16, 1,005.51 and 613.24 is: 918.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.16 : 1,005.51 = 613.24 : x
  2. Step 2: Convert to fraction form
    671.16/1,005.51 = 613.24/x
  3. Step 3: Cross multiply
    671.16x = 1,005.51 × 613.24
  4. Step 4: Simplify right side
    671.16x = 616,618.95
  5. Step 5: Solve for x
    x = 616,618.95/671.16
  6. Step 6: Final answer
    x = 918.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.