Home / 43,143.50-64,715.25-11,978.78

Finding the Fourth Proportional to 43,143.50, 64,715.25 and 11,978.78

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Solution

The fourth proportional to 43,143.50, 64,715.25 and 11,978.78 is: 17,968.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,143.50 : 64,715.25 = 11,978.78 : x
  2. Step 2: Convert to fraction form
    43,143.50/64,715.25 = 11,978.78/x
  3. Step 3: Cross multiply
    43,143.50x = 64,715.25 × 11,978.78
  4. Step 4: Simplify right side
    43,143.50x = 775,209,742.40
  5. Step 5: Solve for x
    x = 775,209,742.40/43,143.50
  6. Step 6: Final answer
    x = 17,968.17

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Double scale
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Similar ratio
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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.