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Finding the Fourth Proportional to 1,520.92, 2,100.05 and 1,188.79

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Solution

The fourth proportional to 1,520.92, 2,100.05 and 1,188.79 is: 1,641.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.92 : 2,100.05 = 1,188.79 : x
  2. Step 2: Convert to fraction form
    1,520.92/2,100.05 = 1,188.79/x
  3. Step 3: Cross multiply
    1,520.92x = 2,100.05 × 1,188.79
  4. Step 4: Simplify right side
    1,520.92x = 2,496,516.16
  5. Step 5: Solve for x
    x = 2,496,516.16/1,520.92
  6. Step 6: Final answer
    x = 1,641.45

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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.