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Finding the Fourth Proportional to 731.76, 1,009.80 and 421.26

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Solution

The fourth proportional to 731.76, 1,009.80 and 421.26 is: 581.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.76 : 1,009.80 = 421.26 : x
  2. Step 2: Convert to fraction form
    731.76/1,009.80 = 421.26/x
  3. Step 3: Cross multiply
    731.76x = 1,009.80 × 421.26
  4. Step 4: Simplify right side
    731.76x = 425,388.35
  5. Step 5: Solve for x
    x = 425,388.35/731.76
  6. Step 6: Final answer
    x = 581.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.