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Finding the Fourth Proportional to 309,108.93, 426,357.28 and 217,422.66

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Solution

The fourth proportional to 309,108.93, 426,357.28 and 217,422.66 is: 299,893.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,108.93 : 426,357.28 = 217,422.66 : x
  2. Step 2: Convert to fraction form
    309,108.93/426,357.28 = 217,422.66/x
  3. Step 3: Cross multiply
    309,108.93x = 426,357.28 × 217,422.66
  4. Step 4: Simplify right side
    309,108.93x = 92,699,735,798.58
  5. Step 5: Solve for x
    x = 92,699,735,798.58/309,108.93
  6. Step 6: Final answer
    x = 299,893.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.