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Finding the Fourth Proportional to 707.56, 977.70 and 553.48

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Solution

The fourth proportional to 707.56, 977.70 and 553.48 is: 764.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.56 : 977.70 = 553.48 : x
  2. Step 2: Convert to fraction form
    707.56/977.70 = 553.48/x
  3. Step 3: Cross multiply
    707.56x = 977.70 × 553.48
  4. Step 4: Simplify right side
    707.56x = 541,137.40
  5. Step 5: Solve for x
    x = 541,137.40/707.56
  6. Step 6: Final answer
    x = 764.79

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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.