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Finding the Fourth Proportional to 942.64, 1,406.48 and 920.72

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Solution

The fourth proportional to 942.64, 1,406.48 and 920.72 is: 1,373.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.64 : 1,406.48 = 920.72 : x
  2. Step 2: Convert to fraction form
    942.64/1,406.48 = 920.72/x
  3. Step 3: Cross multiply
    942.64x = 1,406.48 × 920.72
  4. Step 4: Simplify right side
    942.64x = 1,294,974.27
  5. Step 5: Solve for x
    x = 1,294,974.27/942.64
  6. Step 6: Final answer
    x = 1,373.77

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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.