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Finding the Fourth Proportional to 1,237.58, 1,707.80 and 678

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Solution

The fourth proportional to 1,237.58, 1,707.80 and 678 is: 935.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.58 : 1,707.80 = 678 : x
  2. Step 2: Convert to fraction form
    1,237.58/1,707.80 = 678/x
  3. Step 3: Cross multiply
    1,237.58x = 1,707.80 × 678
  4. Step 4: Simplify right side
    1,237.58x = 1,157,885.01
  5. Step 5: Solve for x
    x = 1,157,885.01/1,237.58
  6. Step 6: Final answer
    x = 935.61

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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.