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Finding the Fourth Proportional to 5,276.70, 7,912.89 and 1,988.01

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Solution

The fourth proportional to 5,276.70, 7,912.89 and 1,988.01 is: 2,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,276.70 : 7,912.89 = 1,988.01 : x
  2. Step 2: Convert to fraction form
    5,276.70/7,912.89 = 1,988.01/x
  3. Step 3: Cross multiply
    5,276.70x = 7,912.89 × 1,988.01
  4. Step 4: Simplify right side
    5,276.70x = 15,730,904.45
  5. Step 5: Solve for x
    x = 15,730,904.45/5,276.70
  6. Step 6: Final answer
    x = 2,981.20

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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.