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Finding the Fourth Proportional to 718.05, 989.76 and 586.83

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Solution

The fourth proportional to 718.05, 989.76 and 586.83 is: 808.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.05 : 989.76 = 586.83 : x
  2. Step 2: Convert to fraction form
    718.05/989.76 = 586.83/x
  3. Step 3: Cross multiply
    718.05x = 989.76 × 586.83
  4. Step 4: Simplify right side
    718.05x = 580,820.86
  5. Step 5: Solve for x
    x = 580,820.86/718.05
  6. Step 6: Final answer
    x = 808.89

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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.