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Finding the Fourth Proportional to 2,591.36, 3,887.50 and 988.46

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Solution

The fourth proportional to 2,591.36, 3,887.50 and 988.46 is: 1,482.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,591.36 : 3,887.50 = 988.46 : x
  2. Step 2: Convert to fraction form
    2,591.36/3,887.50 = 988.46/x
  3. Step 3: Cross multiply
    2,591.36x = 3,887.50 × 988.46
  4. Step 4: Simplify right side
    2,591.36x = 3,842,638.25
  5. Step 5: Solve for x
    x = 3,842,638.25/2,591.36
  6. Step 6: Final answer
    x = 1,482.87

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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.