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Finding the Fourth Proportional to 910.85, 1,255.91 and 711.18

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Solution

The fourth proportional to 910.85, 1,255.91 and 711.18 is: 980.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.85 : 1,255.91 = 711.18 : x
  2. Step 2: Convert to fraction form
    910.85/1,255.91 = 711.18/x
  3. Step 3: Cross multiply
    910.85x = 1,255.91 × 711.18
  4. Step 4: Simplify right side
    910.85x = 893,174.52
  5. Step 5: Solve for x
    x = 893,174.52/910.85
  6. Step 6: Final answer
    x = 980.60

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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.