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Finding the Fourth Proportional to 708,815.08, 978,188.43 and 386,542.81

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Solution

The fourth proportional to 708,815.08, 978,188.43 and 386,542.81 is: 533,441.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,815.08 : 978,188.43 = 386,542.81 : x
  2. Step 2: Convert to fraction form
    708,815.08/978,188.43 = 386,542.81/x
  3. Step 3: Cross multiply
    708,815.08x = 978,188.43 × 386,542.81
  4. Step 4: Simplify right side
    708,815.08x = 378,111,704,441.69
  5. Step 5: Solve for x
    x = 378,111,704,441.69/708,815.08
  6. Step 6: Final answer
    x = 533,441.96

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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.