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Finding the Fourth Proportional to 708.37, 977.54 and 397.87

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Solution

The fourth proportional to 708.37, 977.54 and 397.87 is: 549.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.37 : 977.54 = 397.87 : x
  2. Step 2: Convert to fraction form
    708.37/977.54 = 397.87/x
  3. Step 3: Cross multiply
    708.37x = 977.54 × 397.87
  4. Step 4: Simplify right side
    708.37x = 388,928.95
  5. Step 5: Solve for x
    x = 388,928.95/708.37
  6. Step 6: Final answer
    x = 549.05

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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.