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Finding the Fourth Proportional to 191,104.80, 286,657.20 and 86,128.80

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Solution

The fourth proportional to 191,104.80, 286,657.20 and 86,128.80 is: 129,193.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,104.80 : 286,657.20 = 86,128.80 : x
  2. Step 2: Convert to fraction form
    191,104.80/286,657.20 = 86,128.80/x
  3. Step 3: Cross multiply
    191,104.80x = 286,657.20 × 86,128.80
  4. Step 4: Simplify right side
    191,104.80x = 24,689,440,647.36
  5. Step 5: Solve for x
    x = 24,689,440,647.36/191,104.80
  6. Step 6: Final answer
    x = 129,193.20

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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.