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Finding the Fourth Proportional to 749.60, 1,120.80 and 555.20

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Solution

The fourth proportional to 749.60, 1,120.80 and 555.20 is: 830.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.60 : 1,120.80 = 555.20 : x
  2. Step 2: Convert to fraction form
    749.60/1,120.80 = 555.20/x
  3. Step 3: Cross multiply
    749.60x = 1,120.80 × 555.20
  4. Step 4: Simplify right side
    749.60x = 622,268.16
  5. Step 5: Solve for x
    x = 622,268.16/749.60
  6. Step 6: Final answer
    x = 830.13

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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.