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Finding the Fourth Proportional to 85,689.80, 128,655.64 and 53,997.13

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Solution

The fourth proportional to 85,689.80, 128,655.64 and 53,997.13 is: 81,071.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,689.80 : 128,655.64 = 53,997.13 : x
  2. Step 2: Convert to fraction form
    85,689.80/128,655.64 = 53,997.13/x
  3. Step 3: Cross multiply
    85,689.80x = 128,655.64 × 53,997.13
  4. Step 4: Simplify right side
    85,689.80x = 6,947,035,546.63
  5. Step 5: Solve for x
    x = 6,947,035,546.63/85,689.80
  6. Step 6: Final answer
    x = 81,071.91

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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.