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Finding the Fourth Proportional to 708.35, 978.01 and 442.90

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Solution

The fourth proportional to 708.35, 978.01 and 442.90 is: 611.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.35 : 978.01 = 442.90 : x
  2. Step 2: Convert to fraction form
    708.35/978.01 = 442.90/x
  3. Step 3: Cross multiply
    708.35x = 978.01 × 442.90
  4. Step 4: Simplify right side
    708.35x = 433,157.08
  5. Step 5: Solve for x
    x = 433,157.08/708.35
  6. Step 6: Final answer
    x = 611.50

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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.