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Finding the Fourth Proportional to 128,018.89, 191,656.29 and 74,547.65

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Solution

The fourth proportional to 128,018.89, 191,656.29 and 74,547.65 is: 111,604.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,018.89 : 191,656.29 = 74,547.65 : x
  2. Step 2: Convert to fraction form
    128,018.89/191,656.29 = 74,547.65/x
  3. Step 3: Cross multiply
    128,018.89x = 191,656.29 × 74,547.65
  4. Step 4: Simplify right side
    128,018.89x = 14,287,526,785.91
  5. Step 5: Solve for x
    x = 14,287,526,785.91/128,018.89
  6. Step 6: Final answer
    x = 111,604.83

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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.