Home / 1,292.80-1,779.38-1,126.08

Finding the Fourth Proportional to 1,292.80, 1,779.38 and 1,126.08

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Solution

The fourth proportional to 1,292.80, 1,779.38 and 1,126.08 is: 1,549.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.80 : 1,779.38 = 1,126.08 : x
  2. Step 2: Convert to fraction form
    1,292.80/1,779.38 = 1,126.08/x
  3. Step 3: Cross multiply
    1,292.80x = 1,779.38 × 1,126.08
  4. Step 4: Simplify right side
    1,292.80x = 2,003,724.23
  5. Step 5: Solve for x
    x = 2,003,724.23/1,292.80
  6. Step 6: Final answer
    x = 1,549.91

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1.5x scale

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.