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Finding the Fourth Proportional to 860.45, 1,187.36 and 487.44

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Solution

The fourth proportional to 860.45, 1,187.36 and 487.44 is: 672.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.45 : 1,187.36 = 487.44 : x
  2. Step 2: Convert to fraction form
    860.45/1,187.36 = 487.44/x
  3. Step 3: Cross multiply
    860.45x = 1,187.36 × 487.44
  4. Step 4: Simplify right side
    860.45x = 578,769.49
  5. Step 5: Solve for x
    x = 578,769.49/860.45
  6. Step 6: Final answer
    x = 672.64

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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.