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Finding the Fourth Proportional to 18,761.50, 28,111.06 and 13,203.16

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Solution

The fourth proportional to 18,761.50, 28,111.06 and 13,203.16 is: 19,782.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.50 : 28,111.06 = 13,203.16 : x
  2. Step 2: Convert to fraction form
    18,761.50/28,111.06 = 13,203.16/x
  3. Step 3: Cross multiply
    18,761.50x = 28,111.06 × 13,203.16
  4. Step 4: Simplify right side
    18,761.50x = 371,154,822.95
  5. Step 5: Solve for x
    x = 371,154,822.95/18,761.50
  6. Step 6: Final answer
    x = 19,782.79

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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.