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Finding the Fourth Proportional to 426,901.66, 640,373 and 127,405.68

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Solution

The fourth proportional to 426,901.66, 640,373 and 127,405.68 is: 191,114.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,901.66 : 640,373 = 127,405.68 : x
  2. Step 2: Convert to fraction form
    426,901.66/640,373 = 127,405.68/x
  3. Step 3: Cross multiply
    426,901.66x = 640,373 × 127,405.68
  4. Step 4: Simplify right side
    426,901.66x = 81,587,157,518.64
  5. Step 5: Solve for x
    x = 81,587,157,518.64/426,901.66
  6. Step 6: Final answer
    x = 191,114.64

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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.