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Finding the Fourth Proportional to 660,390.40, 910,997.76 and 418,265.60

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Solution

The fourth proportional to 660,390.40, 910,997.76 and 418,265.60 is: 576,990.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,390.40 : 910,997.76 = 418,265.60 : x
  2. Step 2: Convert to fraction form
    660,390.40/910,997.76 = 418,265.60/x
  3. Step 3: Cross multiply
    660,390.40x = 910,997.76 × 418,265.60
  4. Step 4: Simplify right side
    660,390.40x = 381,039,024,685.06
  5. Step 5: Solve for x
    x = 381,039,024,685.06/660,390.40
  6. Step 6: Final answer
    x = 576,990.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.