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Finding the Fourth Proportional to 1,992.76, 2,988.20 and 742.50

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Solution

The fourth proportional to 1,992.76, 2,988.20 and 742.50 is: 1,113.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.76 : 2,988.20 = 742.50 : x
  2. Step 2: Convert to fraction form
    1,992.76/2,988.20 = 742.50/x
  3. Step 3: Cross multiply
    1,992.76x = 2,988.20 × 742.50
  4. Step 4: Simplify right side
    1,992.76x = 2,218,738.50
  5. Step 5: Solve for x
    x = 2,218,738.50/1,992.76
  6. Step 6: Final answer
    x = 1,113.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.