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Finding the Fourth Proportional to 72,457.20, 108,556.20 and 61,311.60

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Solution

The fourth proportional to 72,457.20, 108,556.20 and 61,311.60 is: 91,857.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,457.20 : 108,556.20 = 61,311.60 : x
  2. Step 2: Convert to fraction form
    72,457.20/108,556.20 = 61,311.60/x
  3. Step 3: Cross multiply
    72,457.20x = 108,556.20 × 61,311.60
  4. Step 4: Simplify right side
    72,457.20x = 6,655,754,311.92
  5. Step 5: Solve for x
    x = 6,655,754,311.92/72,457.20
  6. Step 6: Final answer
    x = 91,857.74

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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.