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Finding the Fourth Proportional to 1,312.82, 1,969.23 and 490.13

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Solution

The fourth proportional to 1,312.82, 1,969.23 and 490.13 is: 735.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.82 : 1,969.23 = 490.13 : x
  2. Step 2: Convert to fraction form
    1,312.82/1,969.23 = 490.13/x
  3. Step 3: Cross multiply
    1,312.82x = 1,969.23 × 490.13
  4. Step 4: Simplify right side
    1,312.82x = 965,178.70
  5. Step 5: Solve for x
    x = 965,178.70/1,312.82
  6. Step 6: Final answer
    x = 735.20

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Double scale
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Similar ratio
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1.5x scale

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.