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Finding the Fourth Proportional to 942.12, 1,405.80 and 932.40

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Solution

The fourth proportional to 942.12, 1,405.80 and 932.40 is: 1,391.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.12 : 1,405.80 = 932.40 : x
  2. Step 2: Convert to fraction form
    942.12/1,405.80 = 932.40/x
  3. Step 3: Cross multiply
    942.12x = 1,405.80 × 932.40
  4. Step 4: Simplify right side
    942.12x = 1,310,767.92
  5. Step 5: Solve for x
    x = 1,310,767.92/942.12
  6. Step 6: Final answer
    x = 1,391.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.