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Finding the Fourth Proportional to 1,451.86, 2,178.28 and 478.12

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Solution

The fourth proportional to 1,451.86, 2,178.28 and 478.12 is: 717.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.86 : 2,178.28 = 478.12 : x
  2. Step 2: Convert to fraction form
    1,451.86/2,178.28 = 478.12/x
  3. Step 3: Cross multiply
    1,451.86x = 2,178.28 × 478.12
  4. Step 4: Simplify right side
    1,451.86x = 1,041,479.23
  5. Step 5: Solve for x
    x = 1,041,479.23/1,451.86
  6. Step 6: Final answer
    x = 717.34

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.