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Finding the Fourth Proportional to 28,105.98, 38,782.95 and 15,529.98

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Solution

The fourth proportional to 28,105.98, 38,782.95 and 15,529.98 is: 21,429.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,105.98 : 38,782.95 = 15,529.98 : x
  2. Step 2: Convert to fraction form
    28,105.98/38,782.95 = 15,529.98/x
  3. Step 3: Cross multiply
    28,105.98x = 38,782.95 × 15,529.98
  4. Step 4: Simplify right side
    28,105.98x = 602,298,437.84
  5. Step 5: Solve for x
    x = 602,298,437.84/28,105.98
  6. Step 6: Final answer
    x = 21,429.55

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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.