Home / 39,883.90-55,039.50-21,978.46

Finding the Fourth Proportional to 39,883.90, 55,039.50 and 21,978.46

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Solution

The fourth proportional to 39,883.90, 55,039.50 and 21,978.46 is: 30,330.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,883.90 : 55,039.50 = 21,978.46 : x
  2. Step 2: Convert to fraction form
    39,883.90/55,039.50 = 21,978.46/x
  3. Step 3: Cross multiply
    39,883.90x = 55,039.50 × 21,978.46
  4. Step 4: Simplify right side
    39,883.90x = 1,209,683,449.17
  5. Step 5: Solve for x
    x = 1,209,683,449.17/39,883.90
  6. Step 6: Final answer
    x = 30,330.12

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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.