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Finding the Fourth Proportional to 715,383.50, 987,228.96 and 393,114.35

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Solution

The fourth proportional to 715,383.50, 987,228.96 and 393,114.35 is: 542,497.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,383.50 : 987,228.96 = 393,114.35 : x
  2. Step 2: Convert to fraction form
    715,383.50/987,228.96 = 393,114.35/x
  3. Step 3: Cross multiply
    715,383.50x = 987,228.96 × 393,114.35
  4. Step 4: Simplify right side
    715,383.50x = 388,093,872,728.44
  5. Step 5: Solve for x
    x = 388,093,872,728.44/715,383.50
  6. Step 6: Final answer
    x = 542,497.66

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Half scale
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Double scale
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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.