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Finding the Fourth Proportional to 38,993.89, 58,495.69 and 12,691.57

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Solution

The fourth proportional to 38,993.89, 58,495.69 and 12,691.57 is: 19,038.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,993.89 : 58,495.69 = 12,691.57 : x
  2. Step 2: Convert to fraction form
    38,993.89/58,495.69 = 12,691.57/x
  3. Step 3: Cross multiply
    38,993.89x = 58,495.69 × 12,691.57
  4. Step 4: Simplify right side
    38,993.89x = 742,401,820.13
  5. Step 5: Solve for x
    x = 742,401,820.13/38,993.89
  6. Step 6: Final answer
    x = 19,038.93

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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.