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Finding the Fourth Proportional to 1,318.39, 1,820.90 and 875.52

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Solution

The fourth proportional to 1,318.39, 1,820.90 and 875.52 is: 1,209.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.39 : 1,820.90 = 875.52 : x
  2. Step 2: Convert to fraction form
    1,318.39/1,820.90 = 875.52/x
  3. Step 3: Cross multiply
    1,318.39x = 1,820.90 × 875.52
  4. Step 4: Simplify right side
    1,318.39x = 1,594,236.56
  5. Step 5: Solve for x
    x = 1,594,236.56/1,318.39
  6. Step 6: Final answer
    x = 1,209.23

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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.