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Finding the Fourth Proportional to 665.69, 991.50 and 630.99

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Solution

The fourth proportional to 665.69, 991.50 and 630.99 is: 939.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.69 : 991.50 = 630.99 : x
  2. Step 2: Convert to fraction form
    665.69/991.50 = 630.99/x
  3. Step 3: Cross multiply
    665.69x = 991.50 × 630.99
  4. Step 4: Simplify right side
    665.69x = 625,626.59
  5. Step 5: Solve for x
    x = 625,626.59/665.69
  6. Step 6: Final answer
    x = 939.82

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1.5x scale

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.