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Finding the Fourth Proportional to 72,695.34, 100,320.75 and 39,991.14

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Solution

The fourth proportional to 72,695.34, 100,320.75 and 39,991.14 is: 55,188.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,695.34 : 100,320.75 = 39,991.14 : x
  2. Step 2: Convert to fraction form
    72,695.34/100,320.75 = 39,991.14/x
  3. Step 3: Cross multiply
    72,695.34x = 100,320.75 × 39,991.14
  4. Step 4: Simplify right side
    72,695.34x = 4,011,941,158.16
  5. Step 5: Solve for x
    x = 4,011,941,158.16/72,695.34
  6. Step 6: Final answer
    x = 55,188.42

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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.