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Finding the Fourth Proportional to 390,916.56, 539,186.76 and 358,755.04

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Solution

The fourth proportional to 390,916.56, 539,186.76 and 358,755.04 is: 494,826.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,916.56 : 539,186.76 = 358,755.04 : x
  2. Step 2: Convert to fraction form
    390,916.56/539,186.76 = 358,755.04/x
  3. Step 3: Cross multiply
    390,916.56x = 539,186.76 × 358,755.04
  4. Step 4: Simplify right side
    390,916.56x = 193,435,967,651.27
  5. Step 5: Solve for x
    x = 193,435,967,651.27/390,916.56
  6. Step 6: Final answer
    x = 494,826.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.