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Finding the Fourth Proportional to 918.40, 1,377.84 and 479.68

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Solution

The fourth proportional to 918.40, 1,377.84 and 479.68 is: 719.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.40 : 1,377.84 = 479.68 : x
  2. Step 2: Convert to fraction form
    918.40/1,377.84 = 479.68/x
  3. Step 3: Cross multiply
    918.40x = 1,377.84 × 479.68
  4. Step 4: Simplify right side
    918.40x = 660,922.29
  5. Step 5: Solve for x
    x = 660,922.29/918.40
  6. Step 6: Final answer
    x = 719.65

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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.