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Finding the Fourth Proportional to 1,391.92, 2,088.68 and 526.20

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Solution

The fourth proportional to 1,391.92, 2,088.68 and 526.20 is: 789.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.92 : 2,088.68 = 526.20 : x
  2. Step 2: Convert to fraction form
    1,391.92/2,088.68 = 526.20/x
  3. Step 3: Cross multiply
    1,391.92x = 2,088.68 × 526.20
  4. Step 4: Simplify right side
    1,391.92x = 1,099,063.42
  5. Step 5: Solve for x
    x = 1,099,063.42/1,391.92
  6. Step 6: Final answer
    x = 789.60

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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.