Home / 2,087.28-3,129.80-916.65

Finding the Fourth Proportional to 2,087.28, 3,129.80 and 916.65

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Solution

The fourth proportional to 2,087.28, 3,129.80 and 916.65 is: 1,374.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,087.28 : 3,129.80 = 916.65 : x
  2. Step 2: Convert to fraction form
    2,087.28/3,129.80 = 916.65/x
  3. Step 3: Cross multiply
    2,087.28x = 3,129.80 × 916.65
  4. Step 4: Simplify right side
    2,087.28x = 2,868,926.59
  5. Step 5: Solve for x
    x = 2,868,926.59/2,087.28
  6. Step 6: Final answer
    x = 1,374.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.