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Finding the Fourth Proportional to 631.85, 942.99 and 615.45

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Solution

The fourth proportional to 631.85, 942.99 and 615.45 is: 918.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.85 : 942.99 = 615.45 : x
  2. Step 2: Convert to fraction form
    631.85/942.99 = 615.45/x
  3. Step 3: Cross multiply
    631.85x = 942.99 × 615.45
  4. Step 4: Simplify right side
    631.85x = 580,363.20
  5. Step 5: Solve for x
    x = 580,363.20/631.85
  6. Step 6: Final answer
    x = 918.51

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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.