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Finding the Fourth Proportional to 42,668.40, 64,021.80 and 19,282.80

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Solution

The fourth proportional to 42,668.40, 64,021.80 and 19,282.80 is: 28,932.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,668.40 : 64,021.80 = 19,282.80 : x
  2. Step 2: Convert to fraction form
    42,668.40/64,021.80 = 19,282.80/x
  3. Step 3: Cross multiply
    42,668.40x = 64,021.80 × 19,282.80
  4. Step 4: Simplify right side
    42,668.40x = 1,234,519,565.04
  5. Step 5: Solve for x
    x = 1,234,519,565.04/42,668.40
  6. Step 6: Final answer
    x = 28,932.88

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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.