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Finding the Fourth Proportional to 860.90, 1,187.28 and 713.28

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Solution

The fourth proportional to 860.90, 1,187.28 and 713.28 is: 983.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.90 : 1,187.28 = 713.28 : x
  2. Step 2: Convert to fraction form
    860.90/1,187.28 = 713.28/x
  3. Step 3: Cross multiply
    860.90x = 1,187.28 × 713.28
  4. Step 4: Simplify right side
    860.90x = 846,863.08
  5. Step 5: Solve for x
    x = 846,863.08/860.90
  6. Step 6: Final answer
    x = 983.69

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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.