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Finding the Fourth Proportional to 66,811.48, 91,990.02 and 56,719

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Solution

The fourth proportional to 66,811.48, 91,990.02 and 56,719 is: 78,094.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,811.48 : 91,990.02 = 56,719 : x
  2. Step 2: Convert to fraction form
    66,811.48/91,990.02 = 56,719/x
  3. Step 3: Cross multiply
    66,811.48x = 91,990.02 × 56,719
  4. Step 4: Simplify right side
    66,811.48x = 5,217,581,944.38
  5. Step 5: Solve for x
    x = 5,217,581,944.38/66,811.48
  6. Step 6: Final answer
    x = 78,094.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.