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Finding the Fourth Proportional to 67,812.80, 101,719.20 and 21,070.40

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Solution

The fourth proportional to 67,812.80, 101,719.20 and 21,070.40 is: 31,605.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,812.80 : 101,719.20 = 21,070.40 : x
  2. Step 2: Convert to fraction form
    67,812.80/101,719.20 = 21,070.40/x
  3. Step 3: Cross multiply
    67,812.80x = 101,719.20 × 21,070.40
  4. Step 4: Simplify right side
    67,812.80x = 2,143,264,231.68
  5. Step 5: Solve for x
    x = 2,143,264,231.68/67,812.80
  6. Step 6: Final answer
    x = 31,605.60

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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.