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Finding the Fourth Proportional to 426,945.78, 640,407.65 and 138,755.81

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Solution

The fourth proportional to 426,945.78, 640,407.65 and 138,755.81 is: 208,130.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,945.78 : 640,407.65 = 138,755.81 : x
  2. Step 2: Convert to fraction form
    426,945.78/640,407.65 = 138,755.81/x
  3. Step 3: Cross multiply
    426,945.78x = 640,407.65 × 138,755.81
  4. Step 4: Simplify right side
    426,945.78x = 88,860,282,205.95
  5. Step 5: Solve for x
    x = 88,860,282,205.95/426,945.78
  6. Step 6: Final answer
    x = 208,130.13

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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.