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Finding the Fourth Proportional to 378,779.31, 522,747.54 and 217,689.75

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Solution

The fourth proportional to 378,779.31, 522,747.54 and 217,689.75 is: 300,430.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,779.31 : 522,747.54 = 217,689.75 : x
  2. Step 2: Convert to fraction form
    378,779.31/522,747.54 = 217,689.75/x
  3. Step 3: Cross multiply
    378,779.31x = 522,747.54 × 217,689.75
  4. Step 4: Simplify right side
    378,779.31x = 113,796,781,295.72
  5. Step 5: Solve for x
    x = 113,796,781,295.72/378,779.31
  6. Step 6: Final answer
    x = 300,430.30

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1.5x scale

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.