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Finding the Fourth Proportional to 719.25, 991.78 and 553.10

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Solution

The fourth proportional to 719.25, 991.78 and 553.10 is: 762.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.25 : 991.78 = 553.10 : x
  2. Step 2: Convert to fraction form
    719.25/991.78 = 553.10/x
  3. Step 3: Cross multiply
    719.25x = 991.78 × 553.10
  4. Step 4: Simplify right side
    719.25x = 548,547.18
  5. Step 5: Solve for x
    x = 548,547.18/719.25
  6. Step 6: Final answer
    x = 762.67

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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.