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Finding the Fourth Proportional to 1,021.60, 1,531.84 and 697.28

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Solution

The fourth proportional to 1,021.60, 1,531.84 and 697.28 is: 1,045.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.60 : 1,531.84 = 697.28 : x
  2. Step 2: Convert to fraction form
    1,021.60/1,531.84 = 697.28/x
  3. Step 3: Cross multiply
    1,021.60x = 1,531.84 × 697.28
  4. Step 4: Simplify right side
    1,021.60x = 1,068,121.40
  5. Step 5: Solve for x
    x = 1,068,121.40/1,021.60
  6. Step 6: Final answer
    x = 1,045.54

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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.