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Finding the Fourth Proportional to 15,399.76, 21,395.02 and 15,215.44

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Solution

The fourth proportional to 15,399.76, 21,395.02 and 15,215.44 is: 21,138.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,399.76 : 21,395.02 = 15,215.44 : x
  2. Step 2: Convert to fraction form
    15,399.76/21,395.02 = 15,215.44/x
  3. Step 3: Cross multiply
    15,399.76x = 21,395.02 × 15,215.44
  4. Step 4: Simplify right side
    15,399.76x = 325,534,643.11
  5. Step 5: Solve for x
    x = 325,534,643.11/15,399.76
  6. Step 6: Final answer
    x = 21,138.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.