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Finding the Fourth Proportional to 907.10, 1,360.58 and 321.87

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Solution

The fourth proportional to 907.10, 1,360.58 and 321.87 is: 482.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.10 : 1,360.58 = 321.87 : x
  2. Step 2: Convert to fraction form
    907.10/1,360.58 = 321.87/x
  3. Step 3: Cross multiply
    907.10x = 1,360.58 × 321.87
  4. Step 4: Simplify right side
    907.10x = 437,928.28
  5. Step 5: Solve for x
    x = 437,928.28/907.10
  6. Step 6: Final answer
    x = 482.78

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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.