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Finding the Fourth Proportional to 907.10, 1,360.65 and 809.90

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Solution

The fourth proportional to 907.10, 1,360.65 and 809.90 is: 1,214.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.10 : 1,360.65 = 809.90 : x
  2. Step 2: Convert to fraction form
    907.10/1,360.65 = 809.90/x
  3. Step 3: Cross multiply
    907.10x = 1,360.65 × 809.90
  4. Step 4: Simplify right side
    907.10x = 1,101,990.44
  5. Step 5: Solve for x
    x = 1,101,990.44/907.10
  6. Step 6: Final answer
    x = 1,214.85

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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.