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Finding the Fourth Proportional to 507.61, 761.60 and 215.19

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Solution

The fourth proportional to 507.61, 761.60 and 215.19 is: 322.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.61 : 761.60 = 215.19 : x
  2. Step 2: Convert to fraction form
    507.61/761.60 = 215.19/x
  3. Step 3: Cross multiply
    507.61x = 761.60 × 215.19
  4. Step 4: Simplify right side
    507.61x = 163,888.70
  5. Step 5: Solve for x
    x = 163,888.70/507.61
  6. Step 6: Final answer
    x = 322.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.