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Finding the Fourth Proportional to 85,993.13, 128,655.98 and 75,383.35

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Solution

The fourth proportional to 85,993.13, 128,655.98 and 75,383.35 is: 112,782.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,993.13 : 128,655.98 = 75,383.35 : x
  2. Step 2: Convert to fraction form
    85,993.13/128,655.98 = 75,383.35/x
  3. Step 3: Cross multiply
    85,993.13x = 128,655.98 × 75,383.35
  4. Step 4: Simplify right side
    85,993.13x = 9,698,517,749.74
  5. Step 5: Solve for x
    x = 9,698,517,749.74/85,993.13
  6. Step 6: Final answer
    x = 112,782.47

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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.