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Finding the Fourth Proportional to 1,396.52, 1,927.16 and 790.80

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Solution

The fourth proportional to 1,396.52, 1,927.16 and 790.80 is: 1,091.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.52 : 1,927.16 = 790.80 : x
  2. Step 2: Convert to fraction form
    1,396.52/1,927.16 = 790.80/x
  3. Step 3: Cross multiply
    1,396.52x = 1,927.16 × 790.80
  4. Step 4: Simplify right side
    1,396.52x = 1,523,998.13
  5. Step 5: Solve for x
    x = 1,523,998.13/1,396.52
  6. Step 6: Final answer
    x = 1,091.28

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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.