Home / 1,528.30-2,109.07-865.15

Finding the Fourth Proportional to 1,528.30, 2,109.07 and 865.15

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Solution

The fourth proportional to 1,528.30, 2,109.07 and 865.15 is: 1,193.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.30 : 2,109.07 = 865.15 : x
  2. Step 2: Convert to fraction form
    1,528.30/2,109.07 = 865.15/x
  3. Step 3: Cross multiply
    1,528.30x = 2,109.07 × 865.15
  4. Step 4: Simplify right side
    1,528.30x = 1,824,657.72
  5. Step 5: Solve for x
    x = 1,824,657.72/1,528.30
  6. Step 6: Final answer
    x = 1,193.91

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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.