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Finding the Fourth Proportional to 1,379.70, 1,903.90 and 782.24

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Solution

The fourth proportional to 1,379.70, 1,903.90 and 782.24 is: 1,079.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.70 : 1,903.90 = 782.24 : x
  2. Step 2: Convert to fraction form
    1,379.70/1,903.90 = 782.24/x
  3. Step 3: Cross multiply
    1,379.70x = 1,903.90 × 782.24
  4. Step 4: Simplify right side
    1,379.70x = 1,489,306.74
  5. Step 5: Solve for x
    x = 1,489,306.74/1,379.70
  6. Step 6: Final answer
    x = 1,079.44

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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.