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Finding the Fourth Proportional to 1,532.70, 2,115.12 and 869.51

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Solution

The fourth proportional to 1,532.70, 2,115.12 and 869.51 is: 1,199.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,532.70 : 2,115.12 = 869.51 : x
  2. Step 2: Convert to fraction form
    1,532.70/2,115.12 = 869.51/x
  3. Step 3: Cross multiply
    1,532.70x = 2,115.12 × 869.51
  4. Step 4: Simplify right side
    1,532.70x = 1,839,123.28
  5. Step 5: Solve for x
    x = 1,839,123.28/1,532.70
  6. Step 6: Final answer
    x = 1,199.92

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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.