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Finding the Fourth Proportional to 1,306.60, 1,960.86 and 784.96

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Solution

The fourth proportional to 1,306.60, 1,960.86 and 784.96 is: 1,178.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.60 : 1,960.86 = 784.96 : x
  2. Step 2: Convert to fraction form
    1,306.60/1,960.86 = 784.96/x
  3. Step 3: Cross multiply
    1,306.60x = 1,960.86 × 784.96
  4. Step 4: Simplify right side
    1,306.60x = 1,539,196.67
  5. Step 5: Solve for x
    x = 1,539,196.67/1,306.60
  6. Step 6: Final answer
    x = 1,178.02

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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.