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Finding the Fourth Proportional to 670.18, 1,005.78 and 305.23

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Solution

The fourth proportional to 670.18, 1,005.78 and 305.23 is: 458.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.18 : 1,005.78 = 305.23 : x
  2. Step 2: Convert to fraction form
    670.18/1,005.78 = 305.23/x
  3. Step 3: Cross multiply
    670.18x = 1,005.78 × 305.23
  4. Step 4: Simplify right side
    670.18x = 306,994.23
  5. Step 5: Solve for x
    x = 306,994.23/670.18
  6. Step 6: Final answer
    x = 458.08

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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.