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Finding the Fourth Proportional to 708,834.45, 978,173.78 and 386,550.75

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Solution

The fourth proportional to 708,834.45, 978,173.78 and 386,550.75 is: 533,430.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,834.45 : 978,173.78 = 386,550.75 : x
  2. Step 2: Convert to fraction form
    708,834.45/978,173.78 = 386,550.75/x
  3. Step 3: Cross multiply
    708,834.45x = 978,173.78 × 386,550.75
  4. Step 4: Simplify right side
    708,834.45x = 378,113,806,356.58
  5. Step 5: Solve for x
    x = 378,113,806,356.58/708,834.45
  6. Step 6: Final answer
    x = 533,430.35

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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.