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Finding the Fourth Proportional to 766.60, 1,057.90 and 417.28

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Solution

The fourth proportional to 766.60, 1,057.90 and 417.28 is: 575.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.60 : 1,057.90 = 417.28 : x
  2. Step 2: Convert to fraction form
    766.60/1,057.90 = 417.28/x
  3. Step 3: Cross multiply
    766.60x = 1,057.90 × 417.28
  4. Step 4: Simplify right side
    766.60x = 441,440.51
  5. Step 5: Solve for x
    x = 441,440.51/766.60
  6. Step 6: Final answer
    x = 575.84

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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.