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Finding the Fourth Proportional to 390,215.16, 585,261.72 and 123,940.62

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Solution

The fourth proportional to 390,215.16, 585,261.72 and 123,940.62 is: 185,891.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,215.16 : 585,261.72 = 123,940.62 : x
  2. Step 2: Convert to fraction form
    390,215.16/585,261.72 = 123,940.62/x
  3. Step 3: Cross multiply
    390,215.16x = 585,261.72 × 123,940.62
  4. Step 4: Simplify right side
    390,215.16x = 72,537,700,439.07
  5. Step 5: Solve for x
    x = 72,537,700,439.07/390,215.16
  6. Step 6: Final answer
    x = 185,891.55

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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.