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Finding the Fourth Proportional to 1,479.76, 2,218.71 and 786

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Solution

The fourth proportional to 1,479.76, 2,218.71 and 786 is: 1,178.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.76 : 2,218.71 = 786 : x
  2. Step 2: Convert to fraction form
    1,479.76/2,218.71 = 786/x
  3. Step 3: Cross multiply
    1,479.76x = 2,218.71 × 786
  4. Step 4: Simplify right side
    1,479.76x = 1,743,906.06
  5. Step 5: Solve for x
    x = 1,743,906.06/1,479.76
  6. Step 6: Final answer
    x = 1,178.51

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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.