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Finding the Fourth Proportional to 666.99, 921.38 and 631.96

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Solution

The fourth proportional to 666.99, 921.38 and 631.96 is: 872.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.99 : 921.38 = 631.96 : x
  2. Step 2: Convert to fraction form
    666.99/921.38 = 631.96/x
  3. Step 3: Cross multiply
    666.99x = 921.38 × 631.96
  4. Step 4: Simplify right side
    666.99x = 582,275.30
  5. Step 5: Solve for x
    x = 582,275.30/666.99
  6. Step 6: Final answer
    x = 872.99

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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.