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Finding the Fourth Proportional to 1,988.26, 2,981.78 and 947.71

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Solution

The fourth proportional to 1,988.26, 2,981.78 and 947.71 is: 1,421.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.26 : 2,981.78 = 947.71 : x
  2. Step 2: Convert to fraction form
    1,988.26/2,981.78 = 947.71/x
  3. Step 3: Cross multiply
    1,988.26x = 2,981.78 × 947.71
  4. Step 4: Simplify right side
    1,988.26x = 2,825,865.27
  5. Step 5: Solve for x
    x = 2,825,865.27/1,988.26
  6. Step 6: Final answer
    x = 1,421.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.