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Finding the Fourth Proportional to 2,485, 3,728.70 and 947.08

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Solution

The fourth proportional to 2,485, 3,728.70 and 947.08 is: 1,421.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,485 : 3,728.70 = 947.08 : x
  2. Step 2: Convert to fraction form
    2,485/3,728.70 = 947.08/x
  3. Step 3: Cross multiply
    2,485x = 3,728.70 × 947.08
  4. Step 4: Simplify right side
    2,485x = 3,531,377.20
  5. Step 5: Solve for x
    x = 3,531,377.20/2,485
  6. Step 6: Final answer
    x = 1,421.08

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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.