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Finding the Fourth Proportional to 1,360.10, 2,040.15 and 805.70

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Solution

The fourth proportional to 1,360.10, 2,040.15 and 805.70 is: 1,208.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.10 : 2,040.15 = 805.70 : x
  2. Step 2: Convert to fraction form
    1,360.10/2,040.15 = 805.70/x
  3. Step 3: Cross multiply
    1,360.10x = 2,040.15 × 805.70
  4. Step 4: Simplify right side
    1,360.10x = 1,643,748.86
  5. Step 5: Solve for x
    x = 1,643,748.86/1,360.10
  6. Step 6: Final answer
    x = 1,208.55

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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.