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Finding the Fourth Proportional to 39,159.81, 54,040.58 and 21,254.81

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Solution

The fourth proportional to 39,159.81, 54,040.58 and 21,254.81 is: 29,331.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,159.81 : 54,040.58 = 21,254.81 : x
  2. Step 2: Convert to fraction form
    39,159.81/54,040.58 = 21,254.81/x
  3. Step 3: Cross multiply
    39,159.81x = 54,040.58 × 21,254.81
  4. Step 4: Simplify right side
    39,159.81x = 1,148,622,448.43
  5. Step 5: Solve for x
    x = 1,148,622,448.43/39,159.81
  6. Step 6: Final answer
    x = 29,331.67

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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.