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Finding the Fourth Proportional to 978,358.60, 1,467,537.90 and 418,486.60

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Solution

The fourth proportional to 978,358.60, 1,467,537.90 and 418,486.60 is: 627,729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,358.60 : 1,467,537.90 = 418,486.60 : x
  2. Step 2: Convert to fraction form
    978,358.60/1,467,537.90 = 418,486.60/x
  3. Step 3: Cross multiply
    978,358.60x = 1,467,537.90 × 418,486.60
  4. Step 4: Simplify right side
    978,358.60x = 614,144,946,142.14
  5. Step 5: Solve for x
    x = 614,144,946,142.14/978,358.60
  6. Step 6: Final answer
    x = 627,729.90

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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.