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Finding the Fourth Proportional to 14,987.70, 20,681.46 and 8,272.98

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Solution

The fourth proportional to 14,987.70, 20,681.46 and 8,272.98 is: 11,415.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,987.70 : 20,681.46 = 8,272.98 : x
  2. Step 2: Convert to fraction form
    14,987.70/20,681.46 = 8,272.98/x
  3. Step 3: Cross multiply
    14,987.70x = 20,681.46 × 8,272.98
  4. Step 4: Simplify right side
    14,987.70x = 171,097,304.95
  5. Step 5: Solve for x
    x = 171,097,304.95/14,987.70
  6. Step 6: Final answer
    x = 11,415.85

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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.