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Finding the Fourth Proportional to 617.68, 921.08 and 612.13

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Solution

The fourth proportional to 617.68, 921.08 and 612.13 is: 912.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.68 : 921.08 = 612.13 : x
  2. Step 2: Convert to fraction form
    617.68/921.08 = 612.13/x
  3. Step 3: Cross multiply
    617.68x = 921.08 × 612.13
  4. Step 4: Simplify right side
    617.68x = 563,820.70
  5. Step 5: Solve for x
    x = 563,820.70/617.68
  6. Step 6: Final answer
    x = 912.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.