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Finding the Fourth Proportional to 8,253.50, 11,384.79 and 5,421.20

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Solution

The fourth proportional to 8,253.50, 11,384.79 and 5,421.20 is: 7,477.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,253.50 : 11,384.79 = 5,421.20 : x
  2. Step 2: Convert to fraction form
    8,253.50/11,384.79 = 5,421.20/x
  3. Step 3: Cross multiply
    8,253.50x = 11,384.79 × 5,421.20
  4. Step 4: Simplify right side
    8,253.50x = 61,719,223.55
  5. Step 5: Solve for x
    x = 61,719,223.55/8,253.50
  6. Step 6: Final answer
    x = 7,477.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.