Home / 1,917.40-2,876.55-618.88

Finding the Fourth Proportional to 1,917.40, 2,876.55 and 618.88

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Solution

The fourth proportional to 1,917.40, 2,876.55 and 618.88 is: 928.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.40 : 2,876.55 = 618.88 : x
  2. Step 2: Convert to fraction form
    1,917.40/2,876.55 = 618.88/x
  3. Step 3: Cross multiply
    1,917.40x = 2,876.55 × 618.88
  4. Step 4: Simplify right side
    1,917.40x = 1,780,239.26
  5. Step 5: Solve for x
    x = 1,780,239.26/1,917.40
  6. Step 6: Final answer
    x = 928.47

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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.