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Finding the Fourth Proportional to 487.36, 672.12 and 312.76

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Solution

The fourth proportional to 487.36, 672.12 and 312.76 is: 431.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.36 : 672.12 = 312.76 : x
  2. Step 2: Convert to fraction form
    487.36/672.12 = 312.76/x
  3. Step 3: Cross multiply
    487.36x = 672.12 × 312.76
  4. Step 4: Simplify right side
    487.36x = 210,212.25
  5. Step 5: Solve for x
    x = 210,212.25/487.36
  6. Step 6: Final answer
    x = 431.33

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Find fourth proportional to 243.68, 336.06 and 156.38
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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.