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Finding the Fourth Proportional to 1,310.57, 1,962.65 and 847.65

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Solution

The fourth proportional to 1,310.57, 1,962.65 and 847.65 is: 1,269.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.57 : 1,962.65 = 847.65 : x
  2. Step 2: Convert to fraction form
    1,310.57/1,962.65 = 847.65/x
  3. Step 3: Cross multiply
    1,310.57x = 1,962.65 × 847.65
  4. Step 4: Simplify right side
    1,310.57x = 1,663,636.03
  5. Step 5: Solve for x
    x = 1,663,636.03/1,310.57
  6. Step 6: Final answer
    x = 1,269.40

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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.