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Finding the Fourth Proportional to 5,281.81, 7,922.70 and 1,386.20

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Solution

The fourth proportional to 5,281.81, 7,922.70 and 1,386.20 is: 2,079.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,281.81 : 7,922.70 = 1,386.20 : x
  2. Step 2: Convert to fraction form
    5,281.81/7,922.70 = 1,386.20/x
  3. Step 3: Cross multiply
    5,281.81x = 7,922.70 × 1,386.20
  4. Step 4: Simplify right side
    5,281.81x = 10,982,466.55
  5. Step 5: Solve for x
    x = 10,982,466.55/5,281.81
  6. Step 6: Final answer
    x = 2,079.30

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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.