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Finding the Fourth Proportional to 1,192.70, 1,641.72 and 860.60

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Solution

The fourth proportional to 1,192.70, 1,641.72 and 860.60 is: 1,184.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.70 : 1,641.72 = 860.60 : x
  2. Step 2: Convert to fraction form
    1,192.70/1,641.72 = 860.60/x
  3. Step 3: Cross multiply
    1,192.70x = 1,641.72 × 860.60
  4. Step 4: Simplify right side
    1,192.70x = 1,412,864.23
  5. Step 5: Solve for x
    x = 1,412,864.23/1,192.70
  6. Step 6: Final answer
    x = 1,184.59

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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.