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Finding the Fourth Proportional to 864.89, 1,193.21 and 486.70

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Solution

The fourth proportional to 864.89, 1,193.21 and 486.70 is: 671.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.89 : 1,193.21 = 486.70 : x
  2. Step 2: Convert to fraction form
    864.89/1,193.21 = 486.70/x
  3. Step 3: Cross multiply
    864.89x = 1,193.21 × 486.70
  4. Step 4: Simplify right side
    864.89x = 580,733.54
  5. Step 5: Solve for x
    x = 580,733.54/864.89
  6. Step 6: Final answer
    x = 671.45

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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.