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Finding the Fourth Proportional to 128,291.10, 192,145.05 and 65,888.70

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Solution

The fourth proportional to 128,291.10, 192,145.05 and 65,888.70 is: 98,683.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,291.10 : 192,145.05 = 65,888.70 : x
  2. Step 2: Convert to fraction form
    128,291.10/192,145.05 = 65,888.70/x
  3. Step 3: Cross multiply
    128,291.10x = 192,145.05 × 65,888.70
  4. Step 4: Simplify right side
    128,291.10x = 12,660,187,555.94
  5. Step 5: Solve for x
    x = 12,660,187,555.94/128,291.10
  6. Step 6: Final answer
    x = 98,683.29

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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.