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Finding the Fourth Proportional to 541.40, 747.45 and 518.18

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Solution

The fourth proportional to 541.40, 747.45 and 518.18 is: 715.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.40 : 747.45 = 518.18 : x
  2. Step 2: Convert to fraction form
    541.40/747.45 = 518.18/x
  3. Step 3: Cross multiply
    541.40x = 747.45 × 518.18
  4. Step 4: Simplify right side
    541.40x = 387,309.90
  5. Step 5: Solve for x
    x = 387,309.90/541.40
  6. Step 6: Final answer
    x = 715.39

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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.