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Finding the Fourth Proportional to 501.21, 691.47 and 304.65

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Solution

The fourth proportional to 501.21, 691.47 and 304.65 is: 420.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.21 : 691.47 = 304.65 : x
  2. Step 2: Convert to fraction form
    501.21/691.47 = 304.65/x
  3. Step 3: Cross multiply
    501.21x = 691.47 × 304.65
  4. Step 4: Simplify right side
    501.21x = 210,656.34
  5. Step 5: Solve for x
    x = 210,656.34/501.21
  6. Step 6: Final answer
    x = 420.30

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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.