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Finding the Fourth Proportional to 786.72, 1,079.88 and 717.60

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Solution

The fourth proportional to 786.72, 1,079.88 and 717.60 is: 985.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.72 : 1,079.88 = 717.60 : x
  2. Step 2: Convert to fraction form
    786.72/1,079.88 = 717.60/x
  3. Step 3: Cross multiply
    786.72x = 1,079.88 × 717.60
  4. Step 4: Simplify right side
    786.72x = 774,921.89
  5. Step 5: Solve for x
    x = 774,921.89/786.72
  6. Step 6: Final answer
    x = 985.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.