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Finding the Fourth Proportional to 15,868.79, 21,897.74 and 8,697.56

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Solution

The fourth proportional to 15,868.79, 21,897.74 and 8,697.56 is: 12,001.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,868.79 : 21,897.74 = 8,697.56 : x
  2. Step 2: Convert to fraction form
    15,868.79/21,897.74 = 8,697.56/x
  3. Step 3: Cross multiply
    15,868.79x = 21,897.74 × 8,697.56
  4. Step 4: Simplify right side
    15,868.79x = 190,456,819.77
  5. Step 5: Solve for x
    x = 190,456,819.77/15,868.79
  6. Step 6: Final answer
    x = 12,001.98

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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.