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Finding the Fourth Proportional to 619.07, 928.70 and 208.11

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Solution

The fourth proportional to 619.07, 928.70 and 208.11 is: 312.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.07 : 928.70 = 208.11 : x
  2. Step 2: Convert to fraction form
    619.07/928.70 = 208.11/x
  3. Step 3: Cross multiply
    619.07x = 928.70 × 208.11
  4. Step 4: Simplify right side
    619.07x = 193,271.76
  5. Step 5: Solve for x
    x = 193,271.76/619.07
  6. Step 6: Final answer
    x = 312.20

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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.