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Finding the Fourth Proportional to 521.79, 719.71 and 486.62

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Solution

The fourth proportional to 521.79, 719.71 and 486.62 is: 671.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.79 : 719.71 = 486.62 : x
  2. Step 2: Convert to fraction form
    521.79/719.71 = 486.62/x
  3. Step 3: Cross multiply
    521.79x = 719.71 × 486.62
  4. Step 4: Simplify right side
    521.79x = 350,225.28
  5. Step 5: Solve for x
    x = 350,225.28/521.79
  6. Step 6: Final answer
    x = 671.20

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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.