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Finding the Fourth Proportional to 86,012.50, 128,985.57 and 33,415.06

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Solution

The fourth proportional to 86,012.50, 128,985.57 and 33,415.06 is: 50,109.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,012.50 : 128,985.57 = 33,415.06 : x
  2. Step 2: Convert to fraction form
    86,012.50/128,985.57 = 33,415.06/x
  3. Step 3: Cross multiply
    86,012.50x = 128,985.57 × 33,415.06
  4. Step 4: Simplify right side
    86,012.50x = 4,310,060,560.68
  5. Step 5: Solve for x
    x = 4,310,060,560.68/86,012.50
  6. Step 6: Final answer
    x = 50,109.70

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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.