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Finding the Fourth Proportional to 1,190.76, 1,642.32 and 860.28

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Solution

The fourth proportional to 1,190.76, 1,642.32 and 860.28 is: 1,186.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.76 : 1,642.32 = 860.28 : x
  2. Step 2: Convert to fraction form
    1,190.76/1,642.32 = 860.28/x
  3. Step 3: Cross multiply
    1,190.76x = 1,642.32 × 860.28
  4. Step 4: Simplify right side
    1,190.76x = 1,412,855.05
  5. Step 5: Solve for x
    x = 1,412,855.05/1,190.76
  6. Step 6: Final answer
    x = 1,186.52

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Half scale
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Double scale
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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.