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Finding the Fourth Proportional to 18,810.86, 28,220.99 and 13,275.01

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Solution

The fourth proportional to 18,810.86, 28,220.99 and 13,275.01 is: 19,915.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.86 : 28,220.99 = 13,275.01 : x
  2. Step 2: Convert to fraction form
    18,810.86/28,220.99 = 13,275.01/x
  3. Step 3: Cross multiply
    18,810.86x = 28,220.99 × 13,275.01
  4. Step 4: Simplify right side
    18,810.86x = 374,633,924.46
  5. Step 5: Solve for x
    x = 374,633,924.46/18,810.86
  6. Step 6: Final answer
    x = 19,915.83

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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.