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Finding the Fourth Proportional to 22,420.56, 30,938.04 and 12,987.36

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Solution

The fourth proportional to 22,420.56, 30,938.04 and 12,987.36 is: 17,921.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,420.56 : 30,938.04 = 12,987.36 : x
  2. Step 2: Convert to fraction form
    22,420.56/30,938.04 = 12,987.36/x
  3. Step 3: Cross multiply
    22,420.56x = 30,938.04 × 12,987.36
  4. Step 4: Simplify right side
    22,420.56x = 401,803,463.17
  5. Step 5: Solve for x
    x = 401,803,463.17/22,420.56
  6. Step 6: Final answer
    x = 17,921.21

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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.