Home / 42,939.20-64,408.80-18,007.40

Finding the Fourth Proportional to 42,939.20, 64,408.80 and 18,007.40

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Solution

The fourth proportional to 42,939.20, 64,408.80 and 18,007.40 is: 27,011.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,939.20 : 64,408.80 = 18,007.40 : x
  2. Step 2: Convert to fraction form
    42,939.20/64,408.80 = 18,007.40/x
  3. Step 3: Cross multiply
    42,939.20x = 64,408.80 × 18,007.40
  4. Step 4: Simplify right side
    42,939.20x = 1,159,835,025.12
  5. Step 5: Solve for x
    x = 1,159,835,025.12/42,939.20
  6. Step 6: Final answer
    x = 27,011.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.