Home / 1,307.11-1,961.32-485.57

Finding the Fourth Proportional to 1,307.11, 1,961.32 and 485.57

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Solution

The fourth proportional to 1,307.11, 1,961.32 and 485.57 is: 728.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.11 : 1,961.32 = 485.57 : x
  2. Step 2: Convert to fraction form
    1,307.11/1,961.32 = 485.57/x
  3. Step 3: Cross multiply
    1,307.11x = 1,961.32 × 485.57
  4. Step 4: Simplify right side
    1,307.11x = 952,358.15
  5. Step 5: Solve for x
    x = 952,358.15/1,307.11
  6. Step 6: Final answer
    x = 728.60

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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.