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Finding the Fourth Proportional to 719.77, 1,078.68 and 545.89

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Solution

The fourth proportional to 719.77, 1,078.68 and 545.89 is: 818.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.77 : 1,078.68 = 545.89 : x
  2. Step 2: Convert to fraction form
    719.77/1,078.68 = 545.89/x
  3. Step 3: Cross multiply
    719.77x = 1,078.68 × 545.89
  4. Step 4: Simplify right side
    719.77x = 588,840.63
  5. Step 5: Solve for x
    x = 588,840.63/719.77
  6. Step 6: Final answer
    x = 818.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.