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Finding the Fourth Proportional to 15,385, 21,231.39 and 9,015.35

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Solution

The fourth proportional to 15,385, 21,231.39 and 9,015.35 is: 12,441.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385 : 21,231.39 = 9,015.35 : x
  2. Step 2: Convert to fraction form
    15,385/21,231.39 = 9,015.35/x
  3. Step 3: Cross multiply
    15,385x = 21,231.39 × 9,015.35
  4. Step 4: Simplify right side
    15,385x = 191,408,411.84
  5. Step 5: Solve for x
    x = 191,408,411.84/15,385
  6. Step 6: Final answer
    x = 12,441.24

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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.