Home / 1,307.12-1,961.12-485.46

Finding the Fourth Proportional to 1,307.12, 1,961.12 and 485.46

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Solution

The fourth proportional to 1,307.12, 1,961.12 and 485.46 is: 728.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.12 : 1,961.12 = 485.46 : x
  2. Step 2: Convert to fraction form
    1,307.12/1,961.12 = 485.46/x
  3. Step 3: Cross multiply
    1,307.12x = 1,961.12 × 485.46
  4. Step 4: Simplify right side
    1,307.12x = 952,045.32
  5. Step 5: Solve for x
    x = 952,045.32/1,307.12
  6. Step 6: Final answer
    x = 728.35

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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.