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Finding the Fourth Proportional to 38,980.90, 58,477.46 and 12,679.48

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Solution

The fourth proportional to 38,980.90, 58,477.46 and 12,679.48 is: 19,021.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,980.90 : 58,477.46 = 12,679.48 : x
  2. Step 2: Convert to fraction form
    38,980.90/58,477.46 = 12,679.48/x
  3. Step 3: Cross multiply
    38,980.90x = 58,477.46 × 12,679.48
  4. Step 4: Simplify right side
    38,980.90x = 741,463,784.52
  5. Step 5: Solve for x
    x = 741,463,784.52/38,980.90
  6. Step 6: Final answer
    x = 19,021.21

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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.