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Finding the Fourth Proportional to 42,786.40, 64,178.40 and 19,412.80

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Solution

The fourth proportional to 42,786.40, 64,178.40 and 19,412.80 is: 29,118.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,786.40 : 64,178.40 = 19,412.80 : x
  2. Step 2: Convert to fraction form
    42,786.40/64,178.40 = 19,412.80/x
  3. Step 3: Cross multiply
    42,786.40x = 64,178.40 × 19,412.80
  4. Step 4: Simplify right side
    42,786.40x = 1,245,882,443.52
  5. Step 5: Solve for x
    x = 1,245,882,443.52/42,786.40
  6. Step 6: Final answer
    x = 29,118.66

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1.5x scale

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.