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Finding the Fourth Proportional to 18,421.70, 25,491.93 and 15,943.10

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Solution

The fourth proportional to 18,421.70, 25,491.93 and 15,943.10 is: 22,062.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.70 : 25,491.93 = 15,943.10 : x
  2. Step 2: Convert to fraction form
    18,421.70/25,491.93 = 15,943.10/x
  3. Step 3: Cross multiply
    18,421.70x = 25,491.93 × 15,943.10
  4. Step 4: Simplify right side
    18,421.70x = 406,420,389.18
  5. Step 5: Solve for x
    x = 406,420,389.18/18,421.70
  6. Step 6: Final answer
    x = 22,062.05

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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.