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Finding the Fourth Proportional to 1,071.17, 1,478.49 and 699.08

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Solution

The fourth proportional to 1,071.17, 1,478.49 and 699.08 is: 964.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.17 : 1,478.49 = 699.08 : x
  2. Step 2: Convert to fraction form
    1,071.17/1,478.49 = 699.08/x
  3. Step 3: Cross multiply
    1,071.17x = 1,478.49 × 699.08
  4. Step 4: Simplify right side
    1,071.17x = 1,033,582.79
  5. Step 5: Solve for x
    x = 1,033,582.79/1,071.17
  6. Step 6: Final answer
    x = 964.91

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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.