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Finding the Fourth Proportional to 390,357.60, 585,536.40 and 291,213.60

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Solution

The fourth proportional to 390,357.60, 585,536.40 and 291,213.60 is: 436,820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,357.60 : 585,536.40 = 291,213.60 : x
  2. Step 2: Convert to fraction form
    390,357.60/585,536.40 = 291,213.60/x
  3. Step 3: Cross multiply
    390,357.60x = 585,536.40 × 291,213.60
  4. Step 4: Simplify right side
    390,357.60x = 170,516,162,975.04
  5. Step 5: Solve for x
    x = 170,516,162,975.04/390,357.60
  6. Step 6: Final answer
    x = 436,820.40

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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.