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Finding the Fourth Proportional to 942.08, 1,406.20 and 874.40

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Solution

The fourth proportional to 942.08, 1,406.20 and 874.40 is: 1,305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.08 : 1,406.20 = 874.40 : x
  2. Step 2: Convert to fraction form
    942.08/1,406.20 = 874.40/x
  3. Step 3: Cross multiply
    942.08x = 1,406.20 × 874.40
  4. Step 4: Simplify right side
    942.08x = 1,229,581.28
  5. Step 5: Solve for x
    x = 1,229,581.28/942.08
  6. Step 6: Final answer
    x = 1,305.18

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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.