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Finding the Fourth Proportional to 805.71, 1,111.92 and 630.75

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Solution

The fourth proportional to 805.71, 1,111.92 and 630.75 is: 870.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.71 : 1,111.92 = 630.75 : x
  2. Step 2: Convert to fraction form
    805.71/1,111.92 = 630.75/x
  3. Step 3: Cross multiply
    805.71x = 1,111.92 × 630.75
  4. Step 4: Simplify right side
    805.71x = 701,343.54
  5. Step 5: Solve for x
    x = 701,343.54/805.71
  6. Step 6: Final answer
    x = 870.47

Related Problems

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Half scale
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Double scale
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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.