Home / 1,420.60-1,960.30-1,047.78

Finding the Fourth Proportional to 1,420.60, 1,960.30 and 1,047.78

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Solution

The fourth proportional to 1,420.60, 1,960.30 and 1,047.78 is: 1,445.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.60 : 1,960.30 = 1,047.78 : x
  2. Step 2: Convert to fraction form
    1,420.60/1,960.30 = 1,047.78/x
  3. Step 3: Cross multiply
    1,420.60x = 1,960.30 × 1,047.78
  4. Step 4: Simplify right side
    1,420.60x = 2,053,963.13
  5. Step 5: Solve for x
    x = 2,053,963.13/1,420.60
  6. Step 6: Final answer
    x = 1,445.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.