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Finding the Fourth Proportional to 1,238.02, 1,708.66 and 706.90

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Solution

The fourth proportional to 1,238.02, 1,708.66 and 706.90 is: 975.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.02 : 1,708.66 = 706.90 : x
  2. Step 2: Convert to fraction form
    1,238.02/1,708.66 = 706.90/x
  3. Step 3: Cross multiply
    1,238.02x = 1,708.66 × 706.90
  4. Step 4: Simplify right side
    1,238.02x = 1,207,851.75
  5. Step 5: Solve for x
    x = 1,207,851.75/1,238.02
  6. Step 6: Final answer
    x = 975.63

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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.