Home / 19,987.81-29,970.71-8,138.56

Finding the Fourth Proportional to 19,987.81, 29,970.71 and 8,138.56

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Solution

The fourth proportional to 19,987.81, 29,970.71 and 8,138.56 is: 12,203.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.81 : 29,970.71 = 8,138.56 : x
  2. Step 2: Convert to fraction form
    19,987.81/29,970.71 = 8,138.56/x
  3. Step 3: Cross multiply
    19,987.81x = 29,970.71 × 8,138.56
  4. Step 4: Simplify right side
    19,987.81x = 243,918,392.67
  5. Step 5: Solve for x
    x = 243,918,392.67/19,987.81
  6. Step 6: Final answer
    x = 12,203.36

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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.