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Finding the Fourth Proportional to 1,071.20, 1,478.76 and 678.08

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Solution

The fourth proportional to 1,071.20, 1,478.76 and 678.08 is: 936.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.20 : 1,478.76 = 678.08 : x
  2. Step 2: Convert to fraction form
    1,071.20/1,478.76 = 678.08/x
  3. Step 3: Cross multiply
    1,071.20x = 1,478.76 × 678.08
  4. Step 4: Simplify right side
    1,071.20x = 1,002,717.58
  5. Step 5: Solve for x
    x = 1,002,717.58/1,071.20
  6. Step 6: Final answer
    x = 936.07

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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.