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Finding the Fourth Proportional to 989.71, 1,366.25 and 711.34

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Solution

The fourth proportional to 989.71, 1,366.25 and 711.34 is: 981.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.71 : 1,366.25 = 711.34 : x
  2. Step 2: Convert to fraction form
    989.71/1,366.25 = 711.34/x
  3. Step 3: Cross multiply
    989.71x = 1,366.25 × 711.34
  4. Step 4: Simplify right side
    989.71x = 971,861.30
  5. Step 5: Solve for x
    x = 971,861.30/989.71
  6. Step 6: Final answer
    x = 981.97

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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.