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Finding the Fourth Proportional to 1,152.20, 1,726.94 and 421.32

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Solution

The fourth proportional to 1,152.20, 1,726.94 and 421.32 is: 631.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.20 : 1,726.94 = 421.32 : x
  2. Step 2: Convert to fraction form
    1,152.20/1,726.94 = 421.32/x
  3. Step 3: Cross multiply
    1,152.20x = 1,726.94 × 421.32
  4. Step 4: Simplify right side
    1,152.20x = 727,594.36
  5. Step 5: Solve for x
    x = 727,594.36/1,152.20
  6. Step 6: Final answer
    x = 631.48

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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.