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Finding the Fourth Proportional to 287.98, 430.95 and 247.88

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Solution

The fourth proportional to 287.98, 430.95 and 247.88 is: 370.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.98 : 430.95 = 247.88 : x
  2. Step 2: Convert to fraction form
    287.98/430.95 = 247.88/x
  3. Step 3: Cross multiply
    287.98x = 430.95 × 247.88
  4. Step 4: Simplify right side
    287.98x = 106,824.42
  5. Step 5: Solve for x
    x = 106,824.42/287.98
  6. Step 6: Final answer
    x = 370.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.