Home / 1,320.20-1,980.36-454.52

Finding the Fourth Proportional to 1,320.20, 1,980.36 and 454.52

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Solution

The fourth proportional to 1,320.20, 1,980.36 and 454.52 is: 681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.20 : 1,980.36 = 454.52 : x
  2. Step 2: Convert to fraction form
    1,320.20/1,980.36 = 454.52/x
  3. Step 3: Cross multiply
    1,320.20x = 1,980.36 × 454.52
  4. Step 4: Simplify right side
    1,320.20x = 900,113.23
  5. Step 5: Solve for x
    x = 900,113.23/1,320.20
  6. Step 6: Final answer
    x = 681.80

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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.