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Finding the Fourth Proportional to 390,755.26, 586,126.43 and 124,512.16

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Solution

The fourth proportional to 390,755.26, 586,126.43 and 124,512.16 is: 186,766.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,755.26 : 586,126.43 = 124,512.16 : x
  2. Step 2: Convert to fraction form
    390,755.26/586,126.43 = 124,512.16/x
  3. Step 3: Cross multiply
    390,755.26x = 586,126.43 × 124,512.16
  4. Step 4: Simplify right side
    390,755.26x = 72,979,867,832.39
  5. Step 5: Solve for x
    x = 72,979,867,832.39/390,755.26
  6. Step 6: Final answer
    x = 186,766.18

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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.