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Finding the Fourth Proportional to 426,605.13, 640,012.94 and 127,084.54

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Solution

The fourth proportional to 426,605.13, 640,012.94 and 127,084.54 is: 190,658.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,605.13 : 640,012.94 = 127,084.54 : x
  2. Step 2: Convert to fraction form
    426,605.13/640,012.94 = 127,084.54/x
  3. Step 3: Cross multiply
    426,605.13x = 640,012.94 × 127,084.54
  4. Step 4: Simplify right side
    426,605.13x = 81,335,750,073.95
  5. Step 5: Solve for x
    x = 81,335,750,073.95/426,605.13
  6. Step 6: Final answer
    x = 190,658.16

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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.