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Finding the Fourth Proportional to 670.20, 1,004.74 and 304.90

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Solution

The fourth proportional to 670.20, 1,004.74 and 304.90 is: 457.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.20 : 1,004.74 = 304.90 : x
  2. Step 2: Convert to fraction form
    670.20/1,004.74 = 304.90/x
  3. Step 3: Cross multiply
    670.20x = 1,004.74 × 304.90
  4. Step 4: Simplify right side
    670.20x = 306,345.23
  5. Step 5: Solve for x
    x = 306,345.23/670.20
  6. Step 6: Final answer
    x = 457.10

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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.