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Finding the Fourth Proportional to 722.89, 1,084.47 and 619.91

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Solution

The fourth proportional to 722.89, 1,084.47 and 619.91 is: 929.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.89 : 1,084.47 = 619.91 : x
  2. Step 2: Convert to fraction form
    722.89/1,084.47 = 619.91/x
  3. Step 3: Cross multiply
    722.89x = 1,084.47 × 619.91
  4. Step 4: Simplify right side
    722.89x = 672,273.80
  5. Step 5: Solve for x
    x = 672,273.80/722.89
  6. Step 6: Final answer
    x = 929.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.