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Finding the Fourth Proportional to 1,121.60, 1,681.72 and 505.20

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Solution

The fourth proportional to 1,121.60, 1,681.72 and 505.20 is: 757.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.60 : 1,681.72 = 505.20 : x
  2. Step 2: Convert to fraction form
    1,121.60/1,681.72 = 505.20/x
  3. Step 3: Cross multiply
    1,121.60x = 1,681.72 × 505.20
  4. Step 4: Simplify right side
    1,121.60x = 849,604.94
  5. Step 5: Solve for x
    x = 849,604.94/1,121.60
  6. Step 6: Final answer
    x = 757.49

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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.