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Finding the Fourth Proportional to 1,117.65, 1,675.90 and 423.79

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Solution

The fourth proportional to 1,117.65, 1,675.90 and 423.79 is: 635.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.65 : 1,675.90 = 423.79 : x
  2. Step 2: Convert to fraction form
    1,117.65/1,675.90 = 423.79/x
  3. Step 3: Cross multiply
    1,117.65x = 1,675.90 × 423.79
  4. Step 4: Simplify right side
    1,117.65x = 710,227.78
  5. Step 5: Solve for x
    x = 710,227.78/1,117.65
  6. Step 6: Final answer
    x = 635.47

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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.