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Finding the Fourth Proportional to 390,642.42, 585,803.25 and 124,331.43

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Solution

The fourth proportional to 390,642.42, 585,803.25 and 124,331.43 is: 186,446.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,642.42 : 585,803.25 = 124,331.43 : x
  2. Step 2: Convert to fraction form
    390,642.42/585,803.25 = 124,331.43/x
  3. Step 3: Cross multiply
    390,642.42x = 585,803.25 × 124,331.43
  4. Step 4: Simplify right side
    390,642.42x = 72,833,755,771.15
  5. Step 5: Solve for x
    x = 72,833,755,771.15/390,642.42
  6. Step 6: Final answer
    x = 186,446.10

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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.