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Finding the Fourth Proportional to 860.19, 1,187.07 and 487.17

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Solution

The fourth proportional to 860.19, 1,187.07 and 487.17 is: 672.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.19 : 1,187.07 = 487.17 : x
  2. Step 2: Convert to fraction form
    860.19/1,187.07 = 487.17/x
  3. Step 3: Cross multiply
    860.19x = 1,187.07 × 487.17
  4. Step 4: Simplify right side
    860.19x = 578,304.89
  5. Step 5: Solve for x
    x = 578,304.89/860.19
  6. Step 6: Final answer
    x = 672.30

Related Problems

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Half scale
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Double scale
Find fourth proportional to 861.19, 1,188.45 and 488.17
Similar ratio
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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.