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Finding the Fourth Proportional to 907.80, 1,360.90 and 542.20

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Solution

The fourth proportional to 907.80, 1,360.90 and 542.20 is: 812.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.80 : 1,360.90 = 542.20 : x
  2. Step 2: Convert to fraction form
    907.80/1,360.90 = 542.20/x
  3. Step 3: Cross multiply
    907.80x = 1,360.90 × 542.20
  4. Step 4: Simplify right side
    907.80x = 737,879.98
  5. Step 5: Solve for x
    x = 737,879.98/907.80
  6. Step 6: Final answer
    x = 812.82

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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.