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Finding the Fourth Proportional to 18,571.91, 27,854.88 and 5,421.20

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Solution

The fourth proportional to 18,571.91, 27,854.88 and 5,421.20 is: 8,130.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,571.91 : 27,854.88 = 5,421.20 : x
  2. Step 2: Convert to fraction form
    18,571.91/27,854.88 = 5,421.20/x
  3. Step 3: Cross multiply
    18,571.91x = 27,854.88 × 5,421.20
  4. Step 4: Simplify right side
    18,571.91x = 151,006,875.46
  5. Step 5: Solve for x
    x = 151,006,875.46/18,571.91
  6. Step 6: Final answer
    x = 8,130.93

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1.5x scale

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.