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Finding the Fourth Proportional to 485.92, 670.21 and 373.87

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Solution

The fourth proportional to 485.92, 670.21 and 373.87 is: 515.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.92 : 670.21 = 373.87 : x
  2. Step 2: Convert to fraction form
    485.92/670.21 = 373.87/x
  3. Step 3: Cross multiply
    485.92x = 670.21 × 373.87
  4. Step 4: Simplify right side
    485.92x = 250,569.54
  5. Step 5: Solve for x
    x = 250,569.54/485.92
  6. Step 6: Final answer
    x = 515.66

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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.