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Finding the Fourth Proportional to 487.07, 672.05 and 312.38

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Solution

The fourth proportional to 487.07, 672.05 and 312.38 is: 431.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.07 : 672.05 = 312.38 : x
  2. Step 2: Convert to fraction form
    487.07/672.05 = 312.38/x
  3. Step 3: Cross multiply
    487.07x = 672.05 × 312.38
  4. Step 4: Simplify right side
    487.07x = 209,930.06
  5. Step 5: Solve for x
    x = 209,930.06/487.07
  6. Step 6: Final answer
    x = 431.01

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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.