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Finding the Fourth Proportional to 790.86, 1,091.20 and 491.98

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Solution

The fourth proportional to 790.86, 1,091.20 and 491.98 is: 678.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.86 : 1,091.20 = 491.98 : x
  2. Step 2: Convert to fraction form
    790.86/1,091.20 = 491.98/x
  3. Step 3: Cross multiply
    790.86x = 1,091.20 × 491.98
  4. Step 4: Simplify right side
    790.86x = 536,848.58
  5. Step 5: Solve for x
    x = 536,848.58/790.86
  6. Step 6: Final answer
    x = 678.82

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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.