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Finding the Fourth Proportional to 18,420.72, 25,420.78 and 10,037.22

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Solution

The fourth proportional to 18,420.72, 25,420.78 and 10,037.22 is: 13,851.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.72 : 25,420.78 = 10,037.22 : x
  2. Step 2: Convert to fraction form
    18,420.72/25,420.78 = 10,037.22/x
  3. Step 3: Cross multiply
    18,420.72x = 25,420.78 × 10,037.22
  4. Step 4: Simplify right side
    18,420.72x = 255,153,809.23
  5. Step 5: Solve for x
    x = 255,153,809.23/18,420.72
  6. Step 6: Final answer
    x = 13,851.46

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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.