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Finding the Fourth Proportional to 805.75, 1,111.42 and 710.98

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Solution

The fourth proportional to 805.75, 1,111.42 and 710.98 is: 980.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.75 : 1,111.42 = 710.98 : x
  2. Step 2: Convert to fraction form
    805.75/1,111.42 = 710.98/x
  3. Step 3: Cross multiply
    805.75x = 1,111.42 × 710.98
  4. Step 4: Simplify right side
    805.75x = 790,195.50
  5. Step 5: Solve for x
    x = 790,195.50/805.75
  6. Step 6: Final answer
    x = 980.70

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1.5x scale

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.