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Finding the Fourth Proportional to 15,867.72, 21,897.73 and 8,697.50

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Solution

The fourth proportional to 15,867.72, 21,897.73 and 8,697.50 is: 12,002.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,867.72 : 21,897.73 = 8,697.50 : x
  2. Step 2: Convert to fraction form
    15,867.72/21,897.73 = 8,697.50/x
  3. Step 3: Cross multiply
    15,867.72x = 21,897.73 × 8,697.50
  4. Step 4: Simplify right side
    15,867.72x = 190,455,353.70
  5. Step 5: Solve for x
    x = 190,455,353.70/15,867.72
  6. Step 6: Final answer
    x = 12,002.69

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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.