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Finding the Fourth Proportional to 912.69, 1,369.58 and 479.88

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Solution

The fourth proportional to 912.69, 1,369.58 and 479.88 is: 720.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.69 : 1,369.58 = 479.88 : x
  2. Step 2: Convert to fraction form
    912.69/1,369.58 = 479.88/x
  3. Step 3: Cross multiply
    912.69x = 1,369.58 × 479.88
  4. Step 4: Simplify right side
    912.69x = 657,231.65
  5. Step 5: Solve for x
    x = 657,231.65/912.69
  6. Step 6: Final answer
    x = 720.10

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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.