Home / 1,539.20-2,307.20-769.28

Finding the Fourth Proportional to 1,539.20, 2,307.20 and 769.28

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Solution

The fourth proportional to 1,539.20, 2,307.20 and 769.28 is: 1,153.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.20 : 2,307.20 = 769.28 : x
  2. Step 2: Convert to fraction form
    1,539.20/2,307.20 = 769.28/x
  3. Step 3: Cross multiply
    1,539.20x = 2,307.20 × 769.28
  4. Step 4: Simplify right side
    1,539.20x = 1,774,882.82
  5. Step 5: Solve for x
    x = 1,774,882.82/1,539.20
  6. Step 6: Final answer
    x = 1,153.12

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1.5x scale

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.