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Finding the Fourth Proportional to 912.66, 1,369.40 and 479.72

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Solution

The fourth proportional to 912.66, 1,369.40 and 479.72 is: 719.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.66 : 1,369.40 = 479.72 : x
  2. Step 2: Convert to fraction form
    912.66/1,369.40 = 479.72/x
  3. Step 3: Cross multiply
    912.66x = 1,369.40 × 479.72
  4. Step 4: Simplify right side
    912.66x = 656,928.57
  5. Step 5: Solve for x
    x = 656,928.57/912.66
  6. Step 6: Final answer
    x = 719.80

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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.