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Finding the Fourth Proportional to 903.80, 1,355.70 and 752.60

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Solution

The fourth proportional to 903.80, 1,355.70 and 752.60 is: 1,128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.80 : 1,355.70 = 752.60 : x
  2. Step 2: Convert to fraction form
    903.80/1,355.70 = 752.60/x
  3. Step 3: Cross multiply
    903.80x = 1,355.70 × 752.60
  4. Step 4: Simplify right side
    903.80x = 1,020,299.82
  5. Step 5: Solve for x
    x = 1,020,299.82/903.80
  6. Step 6: Final answer
    x = 1,128.90

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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.