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Finding the Fourth Proportional to 1,234.78, 1,703.73 and 710.86

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Solution

The fourth proportional to 1,234.78, 1,703.73 and 710.86 is: 980.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.78 : 1,703.73 = 710.86 : x
  2. Step 2: Convert to fraction form
    1,234.78/1,703.73 = 710.86/x
  3. Step 3: Cross multiply
    1,234.78x = 1,703.73 × 710.86
  4. Step 4: Simplify right side
    1,234.78x = 1,211,113.51
  5. Step 5: Solve for x
    x = 1,211,113.51/1,234.78
  6. Step 6: Final answer
    x = 980.83

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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.