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Finding the Fourth Proportional to 707.42, 976.66 and 486.70

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Solution

The fourth proportional to 707.42, 976.66 and 486.70 is: 671.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.42 : 976.66 = 486.70 : x
  2. Step 2: Convert to fraction form
    707.42/976.66 = 486.70/x
  3. Step 3: Cross multiply
    707.42x = 976.66 × 486.70
  4. Step 4: Simplify right side
    707.42x = 475,336.76
  5. Step 5: Solve for x
    x = 475,336.76/707.42
  6. Step 6: Final answer
    x = 671.93

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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.