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Finding the Fourth Proportional to 86,985.87, 130,315.14 and 68,208.90

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Solution

The fourth proportional to 86,985.87, 130,315.14 and 68,208.90 is: 102,185.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,985.87 : 130,315.14 = 68,208.90 : x
  2. Step 2: Convert to fraction form
    86,985.87/130,315.14 = 68,208.90/x
  3. Step 3: Cross multiply
    86,985.87x = 130,315.14 × 68,208.90
  4. Step 4: Simplify right side
    86,985.87x = 8,888,652,352.75
  5. Step 5: Solve for x
    x = 8,888,652,352.75/86,985.87
  6. Step 6: Final answer
    x = 102,185.01

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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.