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Finding the Fourth Proportional to 85,988.90, 128,983.36 and 36,055.64

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Solution

The fourth proportional to 85,988.90, 128,983.36 and 36,055.64 is: 54,083.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,988.90 : 128,983.36 = 36,055.64 : x
  2. Step 2: Convert to fraction form
    85,988.90/128,983.36 = 36,055.64/x
  3. Step 3: Cross multiply
    85,988.90x = 128,983.36 × 36,055.64
  4. Step 4: Simplify right side
    85,988.90x = 4,650,577,594.15
  5. Step 5: Solve for x
    x = 4,650,577,594.15/85,988.90
  6. Step 6: Final answer
    x = 54,083.46

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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.