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Finding the Fourth Proportional to 72,130.82, 99,568.31 and 64,563.80

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Solution

The fourth proportional to 72,130.82, 99,568.31 and 64,563.80 is: 89,122.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,130.82 : 99,568.31 = 64,563.80 : x
  2. Step 2: Convert to fraction form
    72,130.82/99,568.31 = 64,563.80/x
  3. Step 3: Cross multiply
    72,130.82x = 99,568.31 × 64,563.80
  4. Step 4: Simplify right side
    72,130.82x = 6,428,508,453.18
  5. Step 5: Solve for x
    x = 6,428,508,453.18/72,130.82
  6. Step 6: Final answer
    x = 89,122.91

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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.