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Finding the Fourth Proportional to 715,494.81, 987,399.95 and 393,235.50

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Solution

The fourth proportional to 715,494.81, 987,399.95 and 393,235.50 is: 542,674.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,494.81 : 987,399.95 = 393,235.50 : x
  2. Step 2: Convert to fraction form
    715,494.81/987,399.95 = 393,235.50/x
  3. Step 3: Cross multiply
    715,494.81x = 987,399.95 × 393,235.50
  4. Step 4: Simplify right side
    715,494.81x = 388,280,711,072.05
  5. Step 5: Solve for x
    x = 388,280,711,072.05/715,494.81
  6. Step 6: Final answer
    x = 542,674.39

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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.