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Finding the Fourth Proportional to 670.30, 1,005.54 and 208.11

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Solution

The fourth proportional to 670.30, 1,005.54 and 208.11 is: 312.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.30 : 1,005.54 = 208.11 : x
  2. Step 2: Convert to fraction form
    670.30/1,005.54 = 208.11/x
  3. Step 3: Cross multiply
    670.30x = 1,005.54 × 208.11
  4. Step 4: Simplify right side
    670.30x = 209,262.93
  5. Step 5: Solve for x
    x = 209,262.93/670.30
  6. Step 6: Final answer
    x = 312.19

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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.