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Finding the Fourth Proportional to 865.90, 1,300.38 and 646.66

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Solution

The fourth proportional to 865.90, 1,300.38 and 646.66 is: 971.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.90 : 1,300.38 = 646.66 : x
  2. Step 2: Convert to fraction form
    865.90/1,300.38 = 646.66/x
  3. Step 3: Cross multiply
    865.90x = 1,300.38 × 646.66
  4. Step 4: Simplify right side
    865.90x = 840,903.73
  5. Step 5: Solve for x
    x = 840,903.73/865.90
  6. Step 6: Final answer
    x = 971.13

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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.