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Finding the Fourth Proportional to 85,539.40, 128,309.10 and 76,791.40

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Solution

The fourth proportional to 85,539.40, 128,309.10 and 76,791.40 is: 115,187.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,539.40 : 128,309.10 = 76,791.40 : x
  2. Step 2: Convert to fraction form
    85,539.40/128,309.10 = 76,791.40/x
  3. Step 3: Cross multiply
    85,539.40x = 128,309.10 × 76,791.40
  4. Step 4: Simplify right side
    85,539.40x = 9,853,035,421.74
  5. Step 5: Solve for x
    x = 9,853,035,421.74/85,539.40
  6. Step 6: Final answer
    x = 115,187.10

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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.