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Finding the Fourth Proportional to 661.50, 913.07 and 487.35

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Solution

The fourth proportional to 661.50, 913.07 and 487.35 is: 672.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.50 : 913.07 = 487.35 : x
  2. Step 2: Convert to fraction form
    661.50/913.07 = 487.35/x
  3. Step 3: Cross multiply
    661.50x = 913.07 × 487.35
  4. Step 4: Simplify right side
    661.50x = 444,985.88
  5. Step 5: Solve for x
    x = 444,985.88/661.50
  6. Step 6: Final answer
    x = 672.69

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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.