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Finding the Fourth Proportional to 706.92, 975.05 and 486.40

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Solution

The fourth proportional to 706.92, 975.05 and 486.40 is: 670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.92 : 975.05 = 486.40 : x
  2. Step 2: Convert to fraction form
    706.92/975.05 = 486.40/x
  3. Step 3: Cross multiply
    706.92x = 975.05 × 486.40
  4. Step 4: Simplify right side
    706.92x = 474,259.44
  5. Step 5: Solve for x
    x = 474,259.44/706.92
  6. Step 6: Final answer
    x = 670.89

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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.