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Finding the Fourth Proportional to 18,803.86, 28,218.54 and 7,712.56

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Solution

The fourth proportional to 18,803.86, 28,218.54 and 7,712.56 is: 11,574.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,803.86 : 28,218.54 = 7,712.56 : x
  2. Step 2: Convert to fraction form
    18,803.86/28,218.54 = 7,712.56/x
  3. Step 3: Cross multiply
    18,803.86x = 28,218.54 × 7,712.56
  4. Step 4: Simplify right side
    18,803.86x = 217,637,182.86
  5. Step 5: Solve for x
    x = 217,637,182.86/18,803.86
  6. Step 6: Final answer
    x = 11,574.07

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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.