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Finding the Fourth Proportional to 856.66, 1,182.19 and 478.55

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Solution

The fourth proportional to 856.66, 1,182.19 and 478.55 is: 660.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.66 : 1,182.19 = 478.55 : x
  2. Step 2: Convert to fraction form
    856.66/1,182.19 = 478.55/x
  3. Step 3: Cross multiply
    856.66x = 1,182.19 × 478.55
  4. Step 4: Simplify right side
    856.66x = 565,734.38
  5. Step 5: Solve for x
    x = 565,734.38/856.66
  6. Step 6: Final answer
    x = 660.40

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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.