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Finding the Fourth Proportional to 1,307.18, 1,960.73 and 485.12

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Solution

The fourth proportional to 1,307.18, 1,960.73 and 485.12 is: 727.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.18 : 1,960.73 = 485.12 : x
  2. Step 2: Convert to fraction form
    1,307.18/1,960.73 = 485.12/x
  3. Step 3: Cross multiply
    1,307.18x = 1,960.73 × 485.12
  4. Step 4: Simplify right side
    1,307.18x = 951,189.34
  5. Step 5: Solve for x
    x = 951,189.34/1,307.18
  6. Step 6: Final answer
    x = 727.67

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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.