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Finding the Fourth Proportional to 766.42, 1,057.18 and 486.58

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Solution

The fourth proportional to 766.42, 1,057.18 and 486.58 is: 671.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.42 : 1,057.18 = 486.58 : x
  2. Step 2: Convert to fraction form
    766.42/1,057.18 = 486.58/x
  3. Step 3: Cross multiply
    766.42x = 1,057.18 × 486.58
  4. Step 4: Simplify right side
    766.42x = 514,402.64
  5. Step 5: Solve for x
    x = 514,402.64/766.42
  6. Step 6: Final answer
    x = 671.18

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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.