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Finding the Fourth Proportional to 1,391.88, 2,086.56 and 526.80

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Solution

The fourth proportional to 1,391.88, 2,086.56 and 526.80 is: 789.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.88 : 2,086.56 = 526.80 : x
  2. Step 2: Convert to fraction form
    1,391.88/2,086.56 = 526.80/x
  3. Step 3: Cross multiply
    1,391.88x = 2,086.56 × 526.80
  4. Step 4: Simplify right side
    1,391.88x = 1,099,199.81
  5. Step 5: Solve for x
    x = 1,099,199.81/1,391.88
  6. Step 6: Final answer
    x = 789.72

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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.