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Finding the Fourth Proportional to 646.75, 970.13 and 159.80

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Solution

The fourth proportional to 646.75, 970.13 and 159.80 is: 239.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.75 : 970.13 = 159.80 : x
  2. Step 2: Convert to fraction form
    646.75/970.13 = 159.80/x
  3. Step 3: Cross multiply
    646.75x = 970.13 × 159.80
  4. Step 4: Simplify right side
    646.75x = 155,026.77
  5. Step 5: Solve for x
    x = 155,026.77/646.75
  6. Step 6: Final answer
    x = 239.70

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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.