Home / 1,528.85-2,109.82-865.70

Finding the Fourth Proportional to 1,528.85, 2,109.82 and 865.70

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Solution

The fourth proportional to 1,528.85, 2,109.82 and 865.70 is: 1,194.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.85 : 2,109.82 = 865.70 : x
  2. Step 2: Convert to fraction form
    1,528.85/2,109.82 = 865.70/x
  3. Step 3: Cross multiply
    1,528.85x = 2,109.82 × 865.70
  4. Step 4: Simplify right side
    1,528.85x = 1,826,458.46
  5. Step 5: Solve for x
    x = 1,826,458.46/1,528.85
  6. Step 6: Final answer
    x = 1,194.66

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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.