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Finding the Fourth Proportional to 761.50, 1,142.25 and 305.50

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Solution

The fourth proportional to 761.50, 1,142.25 and 305.50 is: 458.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.50 : 1,142.25 = 305.50 : x
  2. Step 2: Convert to fraction form
    761.50/1,142.25 = 305.50/x
  3. Step 3: Cross multiply
    761.50x = 1,142.25 × 305.50
  4. Step 4: Simplify right side
    761.50x = 348,957.38
  5. Step 5: Solve for x
    x = 348,957.38/761.50
  6. Step 6: Final answer
    x = 458.25

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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.