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Finding the Fourth Proportional to 918.70, 1,374.80 and 672.18

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Solution

The fourth proportional to 918.70, 1,374.80 and 672.18 is: 1,005.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.70 : 1,374.80 = 672.18 : x
  2. Step 2: Convert to fraction form
    918.70/1,374.80 = 672.18/x
  3. Step 3: Cross multiply
    918.70x = 1,374.80 × 672.18
  4. Step 4: Simplify right side
    918.70x = 924,113.06
  5. Step 5: Solve for x
    x = 924,113.06/918.70
  6. Step 6: Final answer
    x = 1,005.89

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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.