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Finding the Fourth Proportional to 708.93, 978.74 and 488.21

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Solution

The fourth proportional to 708.93, 978.74 and 488.21 is: 674.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.93 : 978.74 = 488.21 : x
  2. Step 2: Convert to fraction form
    708.93/978.74 = 488.21/x
  3. Step 3: Cross multiply
    708.93x = 978.74 × 488.21
  4. Step 4: Simplify right side
    708.93x = 477,823.32
  5. Step 5: Solve for x
    x = 477,823.32/708.93
  6. Step 6: Final answer
    x = 674.01

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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.