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Finding the Fourth Proportional to 487.26, 672.57 and 312.57

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Solution

The fourth proportional to 487.26, 672.57 and 312.57 is: 431.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.26 : 672.57 = 312.57 : x
  2. Step 2: Convert to fraction form
    487.26/672.57 = 312.57/x
  3. Step 3: Cross multiply
    487.26x = 672.57 × 312.57
  4. Step 4: Simplify right side
    487.26x = 210,225.20
  5. Step 5: Solve for x
    x = 210,225.20/487.26
  6. Step 6: Final answer
    x = 431.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.