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Finding the Fourth Proportional to 860.38, 1,187.29 and 467.39

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Solution

The fourth proportional to 860.38, 1,187.29 and 467.39 is: 644.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.38 : 1,187.29 = 467.39 : x
  2. Step 2: Convert to fraction form
    860.38/1,187.29 = 467.39/x
  3. Step 3: Cross multiply
    860.38x = 1,187.29 × 467.39
  4. Step 4: Simplify right side
    860.38x = 554,925.14
  5. Step 5: Solve for x
    x = 554,925.14/860.38
  6. Step 6: Final answer
    x = 644.98

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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.