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Finding the Fourth Proportional to 86,486.81, 129,745.89 and 39,124.21

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Solution

The fourth proportional to 86,486.81, 129,745.89 and 39,124.21 is: 58,693.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,486.81 : 129,745.89 = 39,124.21 : x
  2. Step 2: Convert to fraction form
    86,486.81/129,745.89 = 39,124.21/x
  3. Step 3: Cross multiply
    86,486.81x = 129,745.89 × 39,124.21
  4. Step 4: Simplify right side
    86,486.81x = 5,076,205,122.63
  5. Step 5: Solve for x
    x = 5,076,205,122.63/86,486.81
  6. Step 6: Final answer
    x = 58,693.41

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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.