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Finding the Fourth Proportional to 72,059.76, 99,392.40 and 66,111.12

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Solution

The fourth proportional to 72,059.76, 99,392.40 and 66,111.12 is: 91,187.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,059.76 : 99,392.40 = 66,111.12 : x
  2. Step 2: Convert to fraction form
    72,059.76/99,392.40 = 66,111.12/x
  3. Step 3: Cross multiply
    72,059.76x = 99,392.40 × 66,111.12
  4. Step 4: Simplify right side
    72,059.76x = 6,570,942,883.49
  5. Step 5: Solve for x
    x = 6,570,942,883.49/72,059.76
  6. Step 6: Final answer
    x = 91,187.41

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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.