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Finding the Fourth Proportional to 15,622.40, 21,131.20 and 15,622.40

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Solution

The fourth proportional to 15,622.40, 21,131.20 and 15,622.40 is: 21,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,622.40 : 21,131.20 = 15,622.40 : x
  2. Step 2: Convert to fraction form
    15,622.40/21,131.20 = 15,622.40/x
  3. Step 3: Cross multiply
    15,622.40x = 21,131.20 × 15,622.40
  4. Step 4: Simplify right side
    15,622.40x = 330,120,058.88
  5. Step 5: Solve for x
    x = 330,120,058.88/15,622.40
  6. Step 6: Final answer
    x = 21,131.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.