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Finding the Fourth Proportional to 1,192.46, 1,643.85 and 818.87

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Solution

The fourth proportional to 1,192.46, 1,643.85 and 818.87 is: 1,128.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.46 : 1,643.85 = 818.87 : x
  2. Step 2: Convert to fraction form
    1,192.46/1,643.85 = 818.87/x
  3. Step 3: Cross multiply
    1,192.46x = 1,643.85 × 818.87
  4. Step 4: Simplify right side
    1,192.46x = 1,346,091.23
  5. Step 5: Solve for x
    x = 1,346,091.23/1,192.46
  6. Step 6: Final answer
    x = 1,128.84

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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.