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Finding the Fourth Proportional to 918.40, 1,374.72 and 701.28

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Solution

The fourth proportional to 918.40, 1,374.72 and 701.28 is: 1,049.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.40 : 1,374.72 = 701.28 : x
  2. Step 2: Convert to fraction form
    918.40/1,374.72 = 701.28/x
  3. Step 3: Cross multiply
    918.40x = 1,374.72 × 701.28
  4. Step 4: Simplify right side
    918.40x = 964,063.64
  5. Step 5: Solve for x
    x = 964,063.64/918.40
  6. Step 6: Final answer
    x = 1,049.72

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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.