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Finding the Fourth Proportional to 487.51, 672.98 and 312.95

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Solution

The fourth proportional to 487.51, 672.98 and 312.95 is: 432.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.51 : 672.98 = 312.95 : x
  2. Step 2: Convert to fraction form
    487.51/672.98 = 312.95/x
  3. Step 3: Cross multiply
    487.51x = 672.98 × 312.95
  4. Step 4: Simplify right side
    487.51x = 210,609.09
  5. Step 5: Solve for x
    x = 210,609.09/487.51
  6. Step 6: Final answer
    x = 432.01

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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.