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Finding the Fourth Proportional to 708.15, 977.28 and 393.45

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Solution

The fourth proportional to 708.15, 977.28 and 393.45 is: 542.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.15 : 977.28 = 393.45 : x
  2. Step 2: Convert to fraction form
    708.15/977.28 = 393.45/x
  3. Step 3: Cross multiply
    708.15x = 977.28 × 393.45
  4. Step 4: Simplify right side
    708.15x = 384,513.39
  5. Step 5: Solve for x
    x = 384,513.39/708.15
  6. Step 6: Final answer
    x = 542.98

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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.