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Finding the Fourth Proportional to 907.20, 1,360.80 and 712.80

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Solution

The fourth proportional to 907.20, 1,360.80 and 712.80 is: 1,069.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.20 : 1,360.80 = 712.80 : x
  2. Step 2: Convert to fraction form
    907.20/1,360.80 = 712.80/x
  3. Step 3: Cross multiply
    907.20x = 1,360.80 × 712.80
  4. Step 4: Simplify right side
    907.20x = 969,978.24
  5. Step 5: Solve for x
    x = 969,978.24/907.20
  6. Step 6: Final answer
    x = 1,069.20

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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.