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Finding the Fourth Proportional to 971.14, 1,340.25 and 815.62

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Solution

The fourth proportional to 971.14, 1,340.25 and 815.62 is: 1,125.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.14 : 1,340.25 = 815.62 : x
  2. Step 2: Convert to fraction form
    971.14/1,340.25 = 815.62/x
  3. Step 3: Cross multiply
    971.14x = 1,340.25 × 815.62
  4. Step 4: Simplify right side
    971.14x = 1,093,134.71
  5. Step 5: Solve for x
    x = 1,093,134.71/971.14
  6. Step 6: Final answer
    x = 1,125.62

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1.5x scale

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.