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Finding the Fourth Proportional to 493.91, 681.67 and 307.60

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Solution

The fourth proportional to 493.91, 681.67 and 307.60 is: 424.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.91 : 681.67 = 307.60 : x
  2. Step 2: Convert to fraction form
    493.91/681.67 = 307.60/x
  3. Step 3: Cross multiply
    493.91x = 681.67 × 307.60
  4. Step 4: Simplify right side
    493.91x = 209,681.69
  5. Step 5: Solve for x
    x = 209,681.69/493.91
  6. Step 6: Final answer
    x = 424.53

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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.