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Finding the Fourth Proportional to 602.56, 830.70 and 485.92

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Solution

The fourth proportional to 602.56, 830.70 and 485.92 is: 669.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.56 : 830.70 = 485.92 : x
  2. Step 2: Convert to fraction form
    602.56/830.70 = 485.92/x
  3. Step 3: Cross multiply
    602.56x = 830.70 × 485.92
  4. Step 4: Simplify right side
    602.56x = 403,653.74
  5. Step 5: Solve for x
    x = 403,653.74/602.56
  6. Step 6: Final answer
    x = 669.90

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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.