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Finding the Fourth Proportional to 71,111.40, 106,715.70 and 51,406.80

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Solution

The fourth proportional to 71,111.40, 106,715.70 and 51,406.80 is: 77,145.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,111.40 : 106,715.70 = 51,406.80 : x
  2. Step 2: Convert to fraction form
    71,111.40/106,715.70 = 51,406.80/x
  3. Step 3: Cross multiply
    71,111.40x = 106,715.70 × 51,406.80
  4. Step 4: Simplify right side
    71,111.40x = 5,485,912,646.76
  5. Step 5: Solve for x
    x = 5,485,912,646.76/71,111.40
  6. Step 6: Final answer
    x = 77,145.33

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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.