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Finding the Fourth Proportional to 390,097.20, 585,145.80 and 323,612.40

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Solution

The fourth proportional to 390,097.20, 585,145.80 and 323,612.40 is: 485,418.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,097.20 : 585,145.80 = 323,612.40 : x
  2. Step 2: Convert to fraction form
    390,097.20/585,145.80 = 323,612.40/x
  3. Step 3: Cross multiply
    390,097.20x = 585,145.80 × 323,612.40
  4. Step 4: Simplify right side
    390,097.20x = 189,360,436,687.92
  5. Step 5: Solve for x
    x = 189,360,436,687.92/390,097.20
  6. Step 6: Final answer
    x = 485,418.60

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1.5x scale

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.