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Finding the Fourth Proportional to 672.44, 930.30 and 555.80

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Solution

The fourth proportional to 672.44, 930.30 and 555.80 is: 768.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.44 : 930.30 = 555.80 : x
  2. Step 2: Convert to fraction form
    672.44/930.30 = 555.80/x
  3. Step 3: Cross multiply
    672.44x = 930.30 × 555.80
  4. Step 4: Simplify right side
    672.44x = 517,060.74
  5. Step 5: Solve for x
    x = 517,060.74/672.44
  6. Step 6: Final answer
    x = 768.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.