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Finding the Fourth Proportional to 889.07, 1,228.16 and 713.20

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Solution

The fourth proportional to 889.07, 1,228.16 and 713.20 is: 985.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.07 : 1,228.16 = 713.20 : x
  2. Step 2: Convert to fraction form
    889.07/1,228.16 = 713.20/x
  3. Step 3: Cross multiply
    889.07x = 1,228.16 × 713.20
  4. Step 4: Simplify right side
    889.07x = 875,914.01
  5. Step 5: Solve for x
    x = 875,914.01/889.07
  6. Step 6: Final answer
    x = 985.20

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Double scale
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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.