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Finding the Fourth Proportional to 1,478, 2,040.12 and 856.88

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Solution

The fourth proportional to 1,478, 2,040.12 and 856.88 is: 1,182.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478 : 2,040.12 = 856.88 : x
  2. Step 2: Convert to fraction form
    1,478/2,040.12 = 856.88/x
  3. Step 3: Cross multiply
    1,478x = 2,040.12 × 856.88
  4. Step 4: Simplify right side
    1,478x = 1,748,138.03
  5. Step 5: Solve for x
    x = 1,748,138.03/1,478
  6. Step 6: Final answer
    x = 1,182.77

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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.