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Finding the Fourth Proportional to 2,087.76, 3,130.65 and 771.08

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Solution

The fourth proportional to 2,087.76, 3,130.65 and 771.08 is: 1,156.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,087.76 : 3,130.65 = 771.08 : x
  2. Step 2: Convert to fraction form
    2,087.76/3,130.65 = 771.08/x
  3. Step 3: Cross multiply
    2,087.76x = 3,130.65 × 771.08
  4. Step 4: Simplify right side
    2,087.76x = 2,413,981.60
  5. Step 5: Solve for x
    x = 2,413,981.60/2,087.76
  6. Step 6: Final answer
    x = 1,156.25

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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.