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Finding the Fourth Proportional to 1,478.62, 2,217 and 784.86

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Solution

The fourth proportional to 1,478.62, 2,217 and 784.86 is: 1,176.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.62 : 2,217 = 784.86 : x
  2. Step 2: Convert to fraction form
    1,478.62/2,217 = 784.86/x
  3. Step 3: Cross multiply
    1,478.62x = 2,217 × 784.86
  4. Step 4: Simplify right side
    1,478.62x = 1,740,034.62
  5. Step 5: Solve for x
    x = 1,740,034.62/1,478.62
  6. Step 6: Final answer
    x = 1,176.80

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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.