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Finding the Fourth Proportional to 708.83, 978.38 and 499.07

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Solution

The fourth proportional to 708.83, 978.38 and 499.07 is: 688.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.83 : 978.38 = 499.07 : x
  2. Step 2: Convert to fraction form
    708.83/978.38 = 499.07/x
  3. Step 3: Cross multiply
    708.83x = 978.38 × 499.07
  4. Step 4: Simplify right side
    708.83x = 488,281.93
  5. Step 5: Solve for x
    x = 488,281.93/708.83
  6. Step 6: Final answer
    x = 688.85

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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.