Home / 31,014.85-42,812.65-21,987.39

Finding the Fourth Proportional to 31,014.85, 42,812.65 and 21,987.39

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Solution

The fourth proportional to 31,014.85, 42,812.65 and 21,987.39 is: 30,351.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,014.85 : 42,812.65 = 21,987.39 : x
  2. Step 2: Convert to fraction form
    31,014.85/42,812.65 = 21,987.39/x
  3. Step 3: Cross multiply
    31,014.85x = 42,812.65 × 21,987.39
  4. Step 4: Simplify right side
    31,014.85x = 941,338,432.48
  5. Step 5: Solve for x
    x = 941,338,432.48/31,014.85
  6. Step 6: Final answer
    x = 30,351.22

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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.