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Finding the Fourth Proportional to 1,560.40, 2,154 and 1,000.92

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Solution

The fourth proportional to 1,560.40, 2,154 and 1,000.92 is: 1,381.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,560.40 : 2,154 = 1,000.92 : x
  2. Step 2: Convert to fraction form
    1,560.40/2,154 = 1,000.92/x
  3. Step 3: Cross multiply
    1,560.40x = 2,154 × 1,000.92
  4. Step 4: Simplify right side
    1,560.40x = 2,155,981.68
  5. Step 5: Solve for x
    x = 2,155,981.68/1,560.40
  6. Step 6: Final answer
    x = 1,381.69

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Double scale
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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.