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Finding the Fourth Proportional to 72,679.08, 109,017.54 and 20,087.40

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Solution

The fourth proportional to 72,679.08, 109,017.54 and 20,087.40 is: 30,130.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,679.08 : 109,017.54 = 20,087.40 : x
  2. Step 2: Convert to fraction form
    72,679.08/109,017.54 = 20,087.40/x
  3. Step 3: Cross multiply
    72,679.08x = 109,017.54 × 20,087.40
  4. Step 4: Simplify right side
    72,679.08x = 2,189,878,933.00
  5. Step 5: Solve for x
    x = 2,189,878,933.00/72,679.08
  6. Step 6: Final answer
    x = 30,130.80

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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.