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Finding the Fourth Proportional to 39,878.90, 55,030.89 and 21,971.01

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Solution

The fourth proportional to 39,878.90, 55,030.89 and 21,971.01 is: 30,318.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,878.90 : 55,030.89 = 21,971.01 : x
  2. Step 2: Convert to fraction form
    39,878.90/55,030.89 = 21,971.01/x
  3. Step 3: Cross multiply
    39,878.90x = 55,030.89 × 21,971.01
  4. Step 4: Simplify right side
    39,878.90x = 1,209,084,523.26
  5. Step 5: Solve for x
    x = 1,209,084,523.26/39,878.90
  6. Step 6: Final answer
    x = 30,318.90

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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.