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Finding the Fourth Proportional to 708.48, 977.65 and 393.74

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Solution

The fourth proportional to 708.48, 977.65 and 393.74 is: 543.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.48 : 977.65 = 393.74 : x
  2. Step 2: Convert to fraction form
    708.48/977.65 = 393.74/x
  3. Step 3: Cross multiply
    708.48x = 977.65 × 393.74
  4. Step 4: Simplify right side
    708.48x = 384,935.51
  5. Step 5: Solve for x
    x = 384,935.51/708.48
  6. Step 6: Final answer
    x = 543.33

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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.