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Finding the Fourth Proportional to 647.58, 970.40 and 282.17

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Solution

The fourth proportional to 647.58, 970.40 and 282.17 is: 422.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.58 : 970.40 = 282.17 : x
  2. Step 2: Convert to fraction form
    647.58/970.40 = 282.17/x
  3. Step 3: Cross multiply
    647.58x = 970.40 × 282.17
  4. Step 4: Simplify right side
    647.58x = 273,817.77
  5. Step 5: Solve for x
    x = 273,817.77/647.58
  6. Step 6: Final answer
    x = 422.83

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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.