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Finding the Fourth Proportional to 1,319.72, 1,821.72 and 902.24

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Solution

The fourth proportional to 1,319.72, 1,821.72 and 902.24 is: 1,245.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.72 : 1,821.72 = 902.24 : x
  2. Step 2: Convert to fraction form
    1,319.72/1,821.72 = 902.24/x
  3. Step 3: Cross multiply
    1,319.72x = 1,821.72 × 902.24
  4. Step 4: Simplify right side
    1,319.72x = 1,643,628.65
  5. Step 5: Solve for x
    x = 1,643,628.65/1,319.72
  6. Step 6: Final answer
    x = 1,245.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.