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Finding the Fourth Proportional to 741.90, 1,113.20 and 579.90

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Solution

The fourth proportional to 741.90, 1,113.20 and 579.90 is: 870.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.90 : 1,113.20 = 579.90 : x
  2. Step 2: Convert to fraction form
    741.90/1,113.20 = 579.90/x
  3. Step 3: Cross multiply
    741.90x = 1,113.20 × 579.90
  4. Step 4: Simplify right side
    741.90x = 645,544.68
  5. Step 5: Solve for x
    x = 645,544.68/741.90
  6. Step 6: Final answer
    x = 870.12

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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.