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Finding the Fourth Proportional to 65,246.62, 90,038.80 and 38,390.87

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Solution

The fourth proportional to 65,246.62, 90,038.80 and 38,390.87 is: 52,978.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,246.62 : 90,038.80 = 38,390.87 : x
  2. Step 2: Convert to fraction form
    65,246.62/90,038.80 = 38,390.87/x
  3. Step 3: Cross multiply
    65,246.62x = 90,038.80 × 38,390.87
  4. Step 4: Simplify right side
    65,246.62x = 3,456,667,415.56
  5. Step 5: Solve for x
    x = 3,456,667,415.56/65,246.62
  6. Step 6: Final answer
    x = 52,978.49

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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.