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Finding the Fourth Proportional to 15,865.99, 21,850.65 and 15,521.59

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Solution

The fourth proportional to 15,865.99, 21,850.65 and 15,521.59 is: 21,376.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.99 : 21,850.65 = 15,521.59 : x
  2. Step 2: Convert to fraction form
    15,865.99/21,850.65 = 15,521.59/x
  3. Step 3: Cross multiply
    15,865.99x = 21,850.65 × 15,521.59
  4. Step 4: Simplify right side
    15,865.99x = 339,156,830.53
  5. Step 5: Solve for x
    x = 339,156,830.53/15,865.99
  6. Step 6: Final answer
    x = 21,376.34

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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.