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Finding the Fourth Proportional to 85,658.45, 128,208.23 and 77,474.21

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Solution

The fourth proportional to 85,658.45, 128,208.23 and 77,474.21 is: 115,958.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,658.45 : 128,208.23 = 77,474.21 : x
  2. Step 2: Convert to fraction form
    85,658.45/128,208.23 = 77,474.21/x
  3. Step 3: Cross multiply
    85,658.45x = 128,208.23 × 77,474.21
  4. Step 4: Simplify right side
    85,658.45x = 9,932,831,267.90
  5. Step 5: Solve for x
    x = 9,932,831,267.90/85,658.45
  6. Step 6: Final answer
    x = 115,958.57

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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.