Home / 1,098.20-1,645.16-981.36

Finding the Fourth Proportional to 1,098.20, 1,645.16 and 981.36

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Solution

The fourth proportional to 1,098.20, 1,645.16 and 981.36 is: 1,470.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.20 : 1,645.16 = 981.36 : x
  2. Step 2: Convert to fraction form
    1,098.20/1,645.16 = 981.36/x
  3. Step 3: Cross multiply
    1,098.20x = 1,645.16 × 981.36
  4. Step 4: Simplify right side
    1,098.20x = 1,614,485.99
  5. Step 5: Solve for x
    x = 1,614,485.99/1,098.20
  6. Step 6: Final answer
    x = 1,470.13

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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.