Home / 1,515.35-2,091.20-885.74

Finding the Fourth Proportional to 1,515.35, 2,091.20 and 885.74

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Solution

The fourth proportional to 1,515.35, 2,091.20 and 885.74 is: 1,222.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.35 : 2,091.20 = 885.74 : x
  2. Step 2: Convert to fraction form
    1,515.35/2,091.20 = 885.74/x
  3. Step 3: Cross multiply
    1,515.35x = 2,091.20 × 885.74
  4. Step 4: Simplify right side
    1,515.35x = 1,852,253.32
  5. Step 5: Solve for x
    x = 1,852,253.32/1,515.35
  6. Step 6: Final answer
    x = 1,222.33

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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.