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Finding the Fourth Proportional to 488.45, 670.45 and 451.51

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Solution

The fourth proportional to 488.45, 670.45 and 451.51 is: 619.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.45 : 670.45 = 451.51 : x
  2. Step 2: Convert to fraction form
    488.45/670.45 = 451.51/x
  3. Step 3: Cross multiply
    488.45x = 670.45 × 451.51
  4. Step 4: Simplify right side
    488.45x = 302,714.88
  5. Step 5: Solve for x
    x = 302,714.88/488.45
  6. Step 6: Final answer
    x = 619.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.