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Finding the Fourth Proportional to 860.21, 1,186.98 and 487.19

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Solution

The fourth proportional to 860.21, 1,186.98 and 487.19 is: 672.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.21 : 1,186.98 = 487.19 : x
  2. Step 2: Convert to fraction form
    860.21/1,186.98 = 487.19/x
  3. Step 3: Cross multiply
    860.21x = 1,186.98 × 487.19
  4. Step 4: Simplify right side
    860.21x = 578,278.85
  5. Step 5: Solve for x
    x = 578,278.85/860.21
  6. Step 6: Final answer
    x = 672.26

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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.