Home / 1,507.80-2,080.68-918.38

Finding the Fourth Proportional to 1,507.80, 2,080.68 and 918.38

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Solution

The fourth proportional to 1,507.80, 2,080.68 and 918.38 is: 1,267.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,507.80 : 2,080.68 = 918.38 : x
  2. Step 2: Convert to fraction form
    1,507.80/2,080.68 = 918.38/x
  3. Step 3: Cross multiply
    1,507.80x = 2,080.68 × 918.38
  4. Step 4: Simplify right side
    1,507.80x = 1,910,854.90
  5. Step 5: Solve for x
    x = 1,910,854.90/1,507.80
  6. Step 6: Final answer
    x = 1,267.31

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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.