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Finding the Fourth Proportional to 128,411.90, 192,423.45 and 86,810.30

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Solution

The fourth proportional to 128,411.90, 192,423.45 and 86,810.30 is: 130,084.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.90 : 192,423.45 = 86,810.30 : x
  2. Step 2: Convert to fraction form
    128,411.90/192,423.45 = 86,810.30/x
  3. Step 3: Cross multiply
    128,411.90x = 192,423.45 × 86,810.30
  4. Step 4: Simplify right side
    128,411.90x = 16,704,337,421.54
  5. Step 5: Solve for x
    x = 16,704,337,421.54/128,411.90
  6. Step 6: Final answer
    x = 130,084.03

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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.