Home / 128,315.10-192,108.15-121,332.90

Finding the Fourth Proportional to 128,315.10, 192,108.15 and 121,332.90

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Solution

The fourth proportional to 128,315.10, 192,108.15 and 121,332.90 is: 181,654.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,315.10 : 192,108.15 = 121,332.90 : x
  2. Step 2: Convert to fraction form
    128,315.10/192,108.15 = 121,332.90/x
  3. Step 3: Cross multiply
    128,315.10x = 192,108.15 × 121,332.90
  4. Step 4: Simplify right side
    128,315.10x = 23,309,038,953.14
  5. Step 5: Solve for x
    x = 23,309,038,953.14/128,315.10
  6. Step 6: Final answer
    x = 181,654.68

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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.