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Finding the Fourth Proportional to 390,507.39, 585,536.88 and 153,720.90

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Solution

The fourth proportional to 390,507.39, 585,536.88 and 153,720.90 is: 230,493.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,507.39 : 585,536.88 = 153,720.90 : x
  2. Step 2: Convert to fraction form
    390,507.39/585,536.88 = 153,720.90/x
  3. Step 3: Cross multiply
    390,507.39x = 585,536.88 × 153,720.90
  4. Step 4: Simplify right side
    390,507.39x = 90,009,256,176.79
  5. Step 5: Solve for x
    x = 90,009,256,176.79/390,507.39
  6. Step 6: Final answer
    x = 230,493.09

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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.