Home / 1,420.52-1,947.80-1,280.08

Finding the Fourth Proportional to 1,420.52, 1,947.80 and 1,280.08

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Solution

The fourth proportional to 1,420.52, 1,947.80 and 1,280.08 is: 1,755.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.52 : 1,947.80 = 1,280.08 : x
  2. Step 2: Convert to fraction form
    1,420.52/1,947.80 = 1,280.08/x
  3. Step 3: Cross multiply
    1,420.52x = 1,947.80 × 1,280.08
  4. Step 4: Simplify right side
    1,420.52x = 2,493,332.78
  5. Step 5: Solve for x
    x = 2,493,332.78/1,420.52
  6. Step 6: Final answer
    x = 1,755.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.