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Finding the Fourth Proportional to 423,642.60, 635,402.34 and 139,343.94

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Solution

The fourth proportional to 423,642.60, 635,402.34 and 139,343.94 is: 208,995.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,642.60 : 635,402.34 = 139,343.94 : x
  2. Step 2: Convert to fraction form
    423,642.60/635,402.34 = 139,343.94/x
  3. Step 3: Cross multiply
    423,642.60x = 635,402.34 × 139,343.94
  4. Step 4: Simplify right side
    423,642.60x = 88,539,465,540.82
  5. Step 5: Solve for x
    x = 88,539,465,540.82/423,642.60
  6. Step 6: Final answer
    x = 208,995.66

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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.