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Finding the Fourth Proportional to 713,779.52, 985,043.31 and 391,503.20

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Solution

The fourth proportional to 713,779.52, 985,043.31 and 391,503.20 is: 540,289.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,779.52 : 985,043.31 = 391,503.20 : x
  2. Step 2: Convert to fraction form
    713,779.52/985,043.31 = 391,503.20/x
  3. Step 3: Cross multiply
    713,779.52x = 985,043.31 × 391,503.20
  4. Step 4: Simplify right side
    713,779.52x = 385,647,608,003.59
  5. Step 5: Solve for x
    x = 385,647,608,003.59/713,779.52
  6. Step 6: Final answer
    x = 540,289.54

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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.