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Finding the Fourth Proportional to 461.30, 690.70 and 380.50

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Solution

The fourth proportional to 461.30, 690.70 and 380.50 is: 569.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.30 : 690.70 = 380.50 : x
  2. Step 2: Convert to fraction form
    461.30/690.70 = 380.50/x
  3. Step 3: Cross multiply
    461.30x = 690.70 × 380.50
  4. Step 4: Simplify right side
    461.30x = 262,811.35
  5. Step 5: Solve for x
    x = 262,811.35/461.30
  6. Step 6: Final answer
    x = 569.72

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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.