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Finding the Fourth Proportional to 646.64, 970.10 and 281.46

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Solution

The fourth proportional to 646.64, 970.10 and 281.46 is: 422.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.64 : 970.10 = 281.46 : x
  2. Step 2: Convert to fraction form
    646.64/970.10 = 281.46/x
  3. Step 3: Cross multiply
    646.64x = 970.10 × 281.46
  4. Step 4: Simplify right side
    646.64x = 273,044.35
  5. Step 5: Solve for x
    x = 273,044.35/646.64
  6. Step 6: Final answer
    x = 422.25

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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.