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Finding the Fourth Proportional to 72,777.20, 109,170.84 and 28,389.20

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Solution

The fourth proportional to 72,777.20, 109,170.84 and 28,389.20 is: 42,585.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,777.20 : 109,170.84 = 28,389.20 : x
  2. Step 2: Convert to fraction form
    72,777.20/109,170.84 = 28,389.20/x
  3. Step 3: Cross multiply
    72,777.20x = 109,170.84 × 28,389.20
  4. Step 4: Simplify right side
    72,777.20x = 3,099,272,810.93
  5. Step 5: Solve for x
    x = 3,099,272,810.93/72,777.20
  6. Step 6: Final answer
    x = 42,585.77

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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.