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Finding the Fourth Proportional to 1,020.89, 1,532.70 and 690.86

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Solution

The fourth proportional to 1,020.89, 1,532.70 and 690.86 is: 1,037.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.89 : 1,532.70 = 690.86 : x
  2. Step 2: Convert to fraction form
    1,020.89/1,532.70 = 690.86/x
  3. Step 3: Cross multiply
    1,020.89x = 1,532.70 × 690.86
  4. Step 4: Simplify right side
    1,020.89x = 1,058,873.46
  5. Step 5: Solve for x
    x = 1,058,873.46/1,020.89
  6. Step 6: Final answer
    x = 1,037.21

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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.