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Finding the Fourth Proportional to 13,345.65, 20,018.25 and 3,985.71

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Solution

The fourth proportional to 13,345.65, 20,018.25 and 3,985.71 is: 5,978.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,345.65 : 20,018.25 = 3,985.71 : x
  2. Step 2: Convert to fraction form
    13,345.65/20,018.25 = 3,985.71/x
  3. Step 3: Cross multiply
    13,345.65x = 20,018.25 × 3,985.71
  4. Step 4: Simplify right side
    13,345.65x = 79,786,939.21
  5. Step 5: Solve for x
    x = 79,786,939.21/13,345.65
  6. Step 6: Final answer
    x = 5,978.50

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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.