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Finding the Fourth Proportional to 20,761.78, 28,642.53 and 14,477.80

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Solution

The fourth proportional to 20,761.78, 28,642.53 and 14,477.80 is: 19,973.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.78 : 28,642.53 = 14,477.80 : x
  2. Step 2: Convert to fraction form
    20,761.78/28,642.53 = 14,477.80/x
  3. Step 3: Cross multiply
    20,761.78x = 28,642.53 × 14,477.80
  4. Step 4: Simplify right side
    20,761.78x = 414,680,820.83
  5. Step 5: Solve for x
    x = 414,680,820.83/20,761.78
  6. Step 6: Final answer
    x = 19,973.28

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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.