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Finding the Fourth Proportional to 1,432.76, 1,977.58 and 811.96

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Solution

The fourth proportional to 1,432.76, 1,977.58 and 811.96 is: 1,120.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.76 : 1,977.58 = 811.96 : x
  2. Step 2: Convert to fraction form
    1,432.76/1,977.58 = 811.96/x
  3. Step 3: Cross multiply
    1,432.76x = 1,977.58 × 811.96
  4. Step 4: Simplify right side
    1,432.76x = 1,605,715.86
  5. Step 5: Solve for x
    x = 1,605,715.86/1,432.76
  6. Step 6: Final answer
    x = 1,120.72

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Double scale
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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.