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Finding the Fourth Proportional to 715,787.28, 987,805.32 and 389,122.26

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Solution

The fourth proportional to 715,787.28, 987,805.32 and 389,122.26 is: 536,998.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,787.28 : 987,805.32 = 389,122.26 : x
  2. Step 2: Convert to fraction form
    715,787.28/987,805.32 = 389,122.26/x
  3. Step 3: Cross multiply
    715,787.28x = 987,805.32 × 389,122.26
  4. Step 4: Simplify right side
    715,787.28x = 384,377,038,558.42
  5. Step 5: Solve for x
    x = 384,377,038,558.42/715,787.28
  6. Step 6: Final answer
    x = 536,998.98

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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.