Home / 128,115.10-192,172.65-90,717.40

Finding the Fourth Proportional to 128,115.10, 192,172.65 and 90,717.40

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Solution

The fourth proportional to 128,115.10, 192,172.65 and 90,717.40 is: 136,076.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,115.10 : 192,172.65 = 90,717.40 : x
  2. Step 2: Convert to fraction form
    128,115.10/192,172.65 = 90,717.40/x
  3. Step 3: Cross multiply
    128,115.10x = 192,172.65 × 90,717.40
  4. Step 4: Simplify right side
    128,115.10x = 17,433,403,159.11
  5. Step 5: Solve for x
    x = 17,433,403,159.11/128,115.10
  6. Step 6: Final answer
    x = 136,076.10

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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.