Home / 1,507.97-2,081.45-918.80

Finding the Fourth Proportional to 1,507.97, 2,081.45 and 918.80

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Solution

The fourth proportional to 1,507.97, 2,081.45 and 918.80 is: 1,268.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,507.97 : 2,081.45 = 918.80 : x
  2. Step 2: Convert to fraction form
    1,507.97/2,081.45 = 918.80/x
  3. Step 3: Cross multiply
    1,507.97x = 2,081.45 × 918.80
  4. Step 4: Simplify right side
    1,507.97x = 1,912,421.26
  5. Step 5: Solve for x
    x = 1,912,421.26/1,507.97
  6. Step 6: Final answer
    x = 1,268.21

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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.