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Finding the Fourth Proportional to 942.16, 1,411.92 and 421.48

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Solution

The fourth proportional to 942.16, 1,411.92 and 421.48 is: 631.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.16 : 1,411.92 = 421.48 : x
  2. Step 2: Convert to fraction form
    942.16/1,411.92 = 421.48/x
  3. Step 3: Cross multiply
    942.16x = 1,411.92 × 421.48
  4. Step 4: Simplify right side
    942.16x = 595,096.04
  5. Step 5: Solve for x
    x = 595,096.04/942.16
  6. Step 6: Final answer
    x = 631.63

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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.