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Finding the Fourth Proportional to 85,868.70, 128,812.65 and 26,703.90

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Solution

The fourth proportional to 85,868.70, 128,812.65 and 26,703.90 is: 40,058.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,868.70 : 128,812.65 = 26,703.90 : x
  2. Step 2: Convert to fraction form
    85,868.70/128,812.65 = 26,703.90/x
  3. Step 3: Cross multiply
    85,868.70x = 128,812.65 × 26,703.90
  4. Step 4: Simplify right side
    85,868.70x = 3,439,800,124.34
  5. Step 5: Solve for x
    x = 3,439,800,124.34/85,868.70
  6. Step 6: Final answer
    x = 40,058.84

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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.