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Finding the Fourth Proportional to 971.18, 1,340.23 and 572.86

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Solution

The fourth proportional to 971.18, 1,340.23 and 572.86 is: 790.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.18 : 1,340.23 = 572.86 : x
  2. Step 2: Convert to fraction form
    971.18/1,340.23 = 572.86/x
  3. Step 3: Cross multiply
    971.18x = 1,340.23 × 572.86
  4. Step 4: Simplify right side
    971.18x = 767,764.16
  5. Step 5: Solve for x
    x = 767,764.16/971.18
  6. Step 6: Final answer
    x = 790.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.