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Finding the Fourth Proportional to 430.76, 646.14 and 247.88

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Solution

The fourth proportional to 430.76, 646.14 and 247.88 is: 371.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.76 : 646.14 = 247.88 : x
  2. Step 2: Convert to fraction form
    430.76/646.14 = 247.88/x
  3. Step 3: Cross multiply
    430.76x = 646.14 × 247.88
  4. Step 4: Simplify right side
    430.76x = 160,165.18
  5. Step 5: Solve for x
    x = 160,165.18/430.76
  6. Step 6: Final answer
    x = 371.82

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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.