Home / 1,393.47-2,090.90-985.23

Finding the Fourth Proportional to 1,393.47, 2,090.90 and 985.23

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Solution

The fourth proportional to 1,393.47, 2,090.90 and 985.23 is: 1,478.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.47 : 2,090.90 = 985.23 : x
  2. Step 2: Convert to fraction form
    1,393.47/2,090.90 = 985.23/x
  3. Step 3: Cross multiply
    1,393.47x = 2,090.90 × 985.23
  4. Step 4: Simplify right side
    1,393.47x = 2,060,019.87
  5. Step 5: Solve for x
    x = 2,060,019.87/1,393.47
  6. Step 6: Final answer
    x = 1,478.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.