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Finding the Fourth Proportional to 42,799.80, 64,199.70 and 11,209.80

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Solution

The fourth proportional to 42,799.80, 64,199.70 and 11,209.80 is: 16,814.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,799.80 : 64,199.70 = 11,209.80 : x
  2. Step 2: Convert to fraction form
    42,799.80/64,199.70 = 11,209.80/x
  3. Step 3: Cross multiply
    42,799.80x = 64,199.70 × 11,209.80
  4. Step 4: Simplify right side
    42,799.80x = 719,665,797.06
  5. Step 5: Solve for x
    x = 719,665,797.06/42,799.80
  6. Step 6: Final answer
    x = 16,814.70

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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.