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Finding the Fourth Proportional to 1,369.70, 2,053.35 and 821.30

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Solution

The fourth proportional to 1,369.70, 2,053.35 and 821.30 is: 1,231.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.70 : 2,053.35 = 821.30 : x
  2. Step 2: Convert to fraction form
    1,369.70/2,053.35 = 821.30/x
  3. Step 3: Cross multiply
    1,369.70x = 2,053.35 × 821.30
  4. Step 4: Simplify right side
    1,369.70x = 1,686,416.36
  5. Step 5: Solve for x
    x = 1,686,416.36/1,369.70
  6. Step 6: Final answer
    x = 1,231.23

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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.