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Finding the Fourth Proportional to 999.68, 1,496.16 and 615.20

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Solution

The fourth proportional to 999.68, 1,496.16 and 615.20 is: 920.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.68 : 1,496.16 = 615.20 : x
  2. Step 2: Convert to fraction form
    999.68/1,496.16 = 615.20/x
  3. Step 3: Cross multiply
    999.68x = 1,496.16 × 615.20
  4. Step 4: Simplify right side
    999.68x = 920,437.63
  5. Step 5: Solve for x
    x = 920,437.63/999.68
  6. Step 6: Final answer
    x = 920.73

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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.