Home / 128,312.10-192,103.65-121,329.90

Finding the Fourth Proportional to 128,312.10, 192,103.65 and 121,329.90

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Solution

The fourth proportional to 128,312.10, 192,103.65 and 121,329.90 is: 181,650.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,312.10 : 192,103.65 = 121,329.90 : x
  2. Step 2: Convert to fraction form
    128,312.10/192,103.65 = 121,329.90/x
  3. Step 3: Cross multiply
    128,312.10x = 192,103.65 × 121,329.90
  4. Step 4: Simplify right side
    128,312.10x = 23,307,916,644.14
  5. Step 5: Solve for x
    x = 23,307,916,644.14/128,312.10
  6. Step 6: Final answer
    x = 181,650.18

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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.