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Finding the Fourth Proportional to 424,215.30, 636,187.70 and 139,852.86

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Solution

The fourth proportional to 424,215.30, 636,187.70 and 139,852.86 is: 209,734.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    424,215.30 : 636,187.70 = 139,852.86 : x
  2. Step 2: Convert to fraction form
    424,215.30/636,187.70 = 139,852.86/x
  3. Step 3: Cross multiply
    424,215.30x = 636,187.70 × 139,852.86
  4. Step 4: Simplify right side
    424,215.30x = 88,972,669,341.82
  5. Step 5: Solve for x
    x = 88,972,669,341.82/424,215.30
  6. Step 6: Final answer
    x = 209,734.70

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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.