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Finding the Fourth Proportional to 487.29, 672.12 and 312.51

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Solution

The fourth proportional to 487.29, 672.12 and 312.51 is: 431.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.29 : 672.12 = 312.51 : x
  2. Step 2: Convert to fraction form
    487.29/672.12 = 312.51/x
  3. Step 3: Cross multiply
    487.29x = 672.12 × 312.51
  4. Step 4: Simplify right side
    487.29x = 210,044.22
  5. Step 5: Solve for x
    x = 210,044.22/487.29
  6. Step 6: Final answer
    x = 431.05

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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.