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Finding the Fourth Proportional to 39,020.60, 53,848.04 and 21,115.22

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Solution

The fourth proportional to 39,020.60, 53,848.04 and 21,115.22 is: 29,138.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,020.60 : 53,848.04 = 21,115.22 : x
  2. Step 2: Convert to fraction form
    39,020.60/53,848.04 = 21,115.22/x
  3. Step 3: Cross multiply
    39,020.60x = 53,848.04 × 21,115.22
  4. Step 4: Simplify right side
    39,020.60x = 1,137,013,211.17
  5. Step 5: Solve for x
    x = 1,137,013,211.17/39,020.60
  6. Step 6: Final answer
    x = 29,138.79

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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.