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Finding the Fourth Proportional to 426,980.79, 640,449.30 and 127,463.85

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Solution

The fourth proportional to 426,980.79, 640,449.30 and 127,463.85 is: 191,189.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,980.79 : 640,449.30 = 127,463.85 : x
  2. Step 2: Convert to fraction form
    426,980.79/640,449.30 = 127,463.85/x
  3. Step 3: Cross multiply
    426,980.79x = 640,449.30 × 127,463.85
  4. Step 4: Simplify right side
    426,980.79x = 81,634,133,507.81
  5. Step 5: Solve for x
    x = 81,634,133,507.81/426,980.79
  6. Step 6: Final answer
    x = 191,189.24

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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.