Home / 1,307.57-1,961.20-485.62

Finding the Fourth Proportional to 1,307.57, 1,961.20 and 485.62

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Solution

The fourth proportional to 1,307.57, 1,961.20 and 485.62 is: 728.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.57 : 1,961.20 = 485.62 : x
  2. Step 2: Convert to fraction form
    1,307.57/1,961.20 = 485.62/x
  3. Step 3: Cross multiply
    1,307.57x = 1,961.20 × 485.62
  4. Step 4: Simplify right side
    1,307.57x = 952,400.40
  5. Step 5: Solve for x
    x = 952,400.40/1,307.57
  6. Step 6: Final answer
    x = 728.38

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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.