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Finding the Fourth Proportional to 1,323.36, 1,987.80 and 836.76

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Solution

The fourth proportional to 1,323.36, 1,987.80 and 836.76 is: 1,256.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.36 : 1,987.80 = 836.76 : x
  2. Step 2: Convert to fraction form
    1,323.36/1,987.80 = 836.76/x
  3. Step 3: Cross multiply
    1,323.36x = 1,987.80 × 836.76
  4. Step 4: Simplify right side
    1,323.36x = 1,663,311.53
  5. Step 5: Solve for x
    x = 1,663,311.53/1,323.36
  6. Step 6: Final answer
    x = 1,256.89

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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.