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Finding the Fourth Proportional to 647.48, 970.80 and 281.96

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Solution

The fourth proportional to 647.48, 970.80 and 281.96 is: 422.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.48 : 970.80 = 281.96 : x
  2. Step 2: Convert to fraction form
    647.48/970.80 = 281.96/x
  3. Step 3: Cross multiply
    647.48x = 970.80 × 281.96
  4. Step 4: Simplify right side
    647.48x = 273,726.77
  5. Step 5: Solve for x
    x = 273,726.77/647.48
  6. Step 6: Final answer
    x = 422.76

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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.