Home / 1,959.30-2,938.95-660.78

Finding the Fourth Proportional to 1,959.30, 2,938.95 and 660.78

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Solution

The fourth proportional to 1,959.30, 2,938.95 and 660.78 is: 991.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.30 : 2,938.95 = 660.78 : x
  2. Step 2: Convert to fraction form
    1,959.30/2,938.95 = 660.78/x
  3. Step 3: Cross multiply
    1,959.30x = 2,938.95 × 660.78
  4. Step 4: Simplify right side
    1,959.30x = 1,941,999.38
  5. Step 5: Solve for x
    x = 1,941,999.38/1,959.30
  6. Step 6: Final answer
    x = 991.17

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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.