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Finding the Fourth Proportional to 67,811.40, 101,718.90 and 21,065.40

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Solution

The fourth proportional to 67,811.40, 101,718.90 and 21,065.40 is: 31,598.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,811.40 : 101,718.90 = 21,065.40 : x
  2. Step 2: Convert to fraction form
    67,811.40/101,718.90 = 21,065.40/x
  3. Step 3: Cross multiply
    67,811.40x = 101,718.90 × 21,065.40
  4. Step 4: Simplify right side
    67,811.40x = 2,142,749,316.06
  5. Step 5: Solve for x
    x = 2,142,749,316.06/67,811.40
  6. Step 6: Final answer
    x = 31,598.66

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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.