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Finding the Fourth Proportional to 1,152.57, 1,728.40 and 421.98

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Solution

The fourth proportional to 1,152.57, 1,728.40 and 421.98 is: 632.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.57 : 1,728.40 = 421.98 : x
  2. Step 2: Convert to fraction form
    1,152.57/1,728.40 = 421.98/x
  3. Step 3: Cross multiply
    1,152.57x = 1,728.40 × 421.98
  4. Step 4: Simplify right side
    1,152.57x = 729,350.23
  5. Step 5: Solve for x
    x = 729,350.23/1,152.57
  6. Step 6: Final answer
    x = 632.80

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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.