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Finding the Fourth Proportional to 708.51, 977.69 and 393.76

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Solution

The fourth proportional to 708.51, 977.69 and 393.76 is: 543.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.51 : 977.69 = 393.76 : x
  2. Step 2: Convert to fraction form
    708.51/977.69 = 393.76/x
  3. Step 3: Cross multiply
    708.51x = 977.69 × 393.76
  4. Step 4: Simplify right side
    708.51x = 384,968.36
  5. Step 5: Solve for x
    x = 384,968.36/708.51
  6. Step 6: Final answer
    x = 543.35

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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.