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Finding the Fourth Proportional to 907.20, 1,353.31 and 814.86

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Solution

The fourth proportional to 907.20, 1,353.31 and 814.86 is: 1,215.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.20 : 1,353.31 = 814.86 : x
  2. Step 2: Convert to fraction form
    907.20/1,353.31 = 814.86/x
  3. Step 3: Cross multiply
    907.20x = 1,353.31 × 814.86
  4. Step 4: Simplify right side
    907.20x = 1,102,756.15
  5. Step 5: Solve for x
    x = 1,102,756.15/907.20
  6. Step 6: Final answer
    x = 1,215.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.