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Finding the Fourth Proportional to 713,813.70, 985,046.01 and 391,520.97

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Solution

The fourth proportional to 713,813.70, 985,046.01 and 391,520.97 is: 540,289.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,813.70 : 985,046.01 = 391,520.97 : x
  2. Step 2: Convert to fraction form
    713,813.70/985,046.01 = 391,520.97/x
  3. Step 3: Cross multiply
    713,813.70x = 985,046.01 × 391,520.97
  4. Step 4: Simplify right side
    713,813.70x = 385,666,169,329.83
  5. Step 5: Solve for x
    x = 385,666,169,329.83/713,813.70
  6. Step 6: Final answer
    x = 540,289.67

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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.