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Finding the Fourth Proportional to 679.95, 938.54 and 540.32

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Solution

The fourth proportional to 679.95, 938.54 and 540.32 is: 745.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.95 : 938.54 = 540.32 : x
  2. Step 2: Convert to fraction form
    679.95/938.54 = 540.32/x
  3. Step 3: Cross multiply
    679.95x = 938.54 × 540.32
  4. Step 4: Simplify right side
    679.95x = 507,108.59
  5. Step 5: Solve for x
    x = 507,108.59/679.95
  6. Step 6: Final answer
    x = 745.80

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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.