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Finding the Fourth Proportional to 1,101.92, 1,520.51 and 647.71

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Solution

The fourth proportional to 1,101.92, 1,520.51 and 647.71 is: 893.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.92 : 1,520.51 = 647.71 : x
  2. Step 2: Convert to fraction form
    1,101.92/1,520.51 = 647.71/x
  3. Step 3: Cross multiply
    1,101.92x = 1,520.51 × 647.71
  4. Step 4: Simplify right side
    1,101.92x = 984,842.49
  5. Step 5: Solve for x
    x = 984,842.49/1,101.92
  6. Step 6: Final answer
    x = 893.76

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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.