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Finding the Fourth Proportional to 1,235.13, 1,704.40 and 703.90

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Solution

The fourth proportional to 1,235.13, 1,704.40 and 703.90 is: 971.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.13 : 1,704.40 = 703.90 : x
  2. Step 2: Convert to fraction form
    1,235.13/1,704.40 = 703.90/x
  3. Step 3: Cross multiply
    1,235.13x = 1,704.40 × 703.90
  4. Step 4: Simplify right side
    1,235.13x = 1,199,727.16
  5. Step 5: Solve for x
    x = 1,199,727.16/1,235.13
  6. Step 6: Final answer
    x = 971.34

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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.