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Finding the Fourth Proportional to 905.60, 1,357.59 and 752.78

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Solution

The fourth proportional to 905.60, 1,357.59 and 752.78 is: 1,128.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.60 : 1,357.59 = 752.78 : x
  2. Step 2: Convert to fraction form
    905.60/1,357.59 = 752.78/x
  3. Step 3: Cross multiply
    905.60x = 1,357.59 × 752.78
  4. Step 4: Simplify right side
    905.60x = 1,021,966.60
  5. Step 5: Solve for x
    x = 1,021,966.60/905.60
  6. Step 6: Final answer
    x = 1,128.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.