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Finding the Fourth Proportional to 754.40, 1,041.19 and 518.15

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Solution

The fourth proportional to 754.40, 1,041.19 and 518.15 is: 715.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.40 : 1,041.19 = 518.15 : x
  2. Step 2: Convert to fraction form
    754.40/1,041.19 = 518.15/x
  3. Step 3: Cross multiply
    754.40x = 1,041.19 × 518.15
  4. Step 4: Simplify right side
    754.40x = 539,486.10
  5. Step 5: Solve for x
    x = 539,486.10/754.40
  6. Step 6: Final answer
    x = 715.12

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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.