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Finding the Fourth Proportional to 708.64, 977.56 and 498.40

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Solution

The fourth proportional to 708.64, 977.56 and 498.40 is: 687.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.64 : 977.56 = 498.40 : x
  2. Step 2: Convert to fraction form
    708.64/977.56 = 498.40/x
  3. Step 3: Cross multiply
    708.64x = 977.56 × 498.40
  4. Step 4: Simplify right side
    708.64x = 487,215.90
  5. Step 5: Solve for x
    x = 487,215.90/708.64
  6. Step 6: Final answer
    x = 687.54

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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.