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Finding the Fourth Proportional to 426,299.40, 638,606.70 and 276,643.80

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Solution

The fourth proportional to 426,299.40, 638,606.70 and 276,643.80 is: 414,419.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,299.40 : 638,606.70 = 276,643.80 : x
  2. Step 2: Convert to fraction form
    426,299.40/638,606.70 = 276,643.80/x
  3. Step 3: Cross multiply
    426,299.40x = 638,606.70 × 276,643.80
  4. Step 4: Simplify right side
    426,299.40x = 176,666,584,193.46
  5. Step 5: Solve for x
    x = 176,666,584,193.46/426,299.40
  6. Step 6: Final answer
    x = 414,419.03

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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.