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Finding the Fourth Proportional to 709,401.18, 978,994.40 and 387,132.04

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Solution

The fourth proportional to 709,401.18, 978,994.40 and 387,132.04 is: 534,253.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,401.18 : 978,994.40 = 387,132.04 : x
  2. Step 2: Convert to fraction form
    709,401.18/978,994.40 = 387,132.04/x
  3. Step 3: Cross multiply
    709,401.18x = 978,994.40 × 387,132.04
  4. Step 4: Simplify right side
    709,401.18x = 379,000,097,284.92
  5. Step 5: Solve for x
    x = 379,000,097,284.92/709,401.18
  6. Step 6: Final answer
    x = 534,253.55

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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.