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Finding the Fourth Proportional to 353,502.12, 529,938.84 and 128,820.28

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Solution

The fourth proportional to 353,502.12, 529,938.84 and 128,820.28 is: 193,115.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,502.12 : 529,938.84 = 128,820.28 : x
  2. Step 2: Convert to fraction form
    353,502.12/529,938.84 = 128,820.28/x
  3. Step 3: Cross multiply
    353,502.12x = 529,938.84 × 128,820.28
  4. Step 4: Simplify right side
    353,502.12x = 68,266,869,751.68
  5. Step 5: Solve for x
    x = 68,266,869,751.68/353,502.12
  6. Step 6: Final answer
    x = 193,115.87

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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.