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Finding the Fourth Proportional to 645.32, 888.66 and 631.02

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Solution

The fourth proportional to 645.32, 888.66 and 631.02 is: 868.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.32 : 888.66 = 631.02 : x
  2. Step 2: Convert to fraction form
    645.32/888.66 = 631.02/x
  3. Step 3: Cross multiply
    645.32x = 888.66 × 631.02
  4. Step 4: Simplify right side
    645.32x = 560,762.23
  5. Step 5: Solve for x
    x = 560,762.23/645.32
  6. Step 6: Final answer
    x = 868.97

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Double scale
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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.