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Finding the Fourth Proportional to 15,868.16, 21,897.40 and 8,794.40

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Solution

The fourth proportional to 15,868.16, 21,897.40 and 8,794.40 is: 12,135.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,868.16 : 21,897.40 = 8,794.40 : x
  2. Step 2: Convert to fraction form
    15,868.16/21,897.40 = 8,794.40/x
  3. Step 3: Cross multiply
    15,868.16x = 21,897.40 × 8,794.40
  4. Step 4: Simplify right side
    15,868.16x = 192,574,494.56
  5. Step 5: Solve for x
    x = 192,574,494.56/15,868.16
  6. Step 6: Final answer
    x = 12,135.91

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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.