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Finding the Fourth Proportional to 860.40, 1,187.46 and 625.11

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Solution

The fourth proportional to 860.40, 1,187.46 and 625.11 is: 862.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.40 : 1,187.46 = 625.11 : x
  2. Step 2: Convert to fraction form
    860.40/1,187.46 = 625.11/x
  3. Step 3: Cross multiply
    860.40x = 1,187.46 × 625.11
  4. Step 4: Simplify right side
    860.40x = 742,293.12
  5. Step 5: Solve for x
    x = 742,293.12/860.40
  6. Step 6: Final answer
    x = 862.73

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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.