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Finding the Fourth Proportional to 1,405.84, 2,108.76 and 747.76

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Solution

The fourth proportional to 1,405.84, 2,108.76 and 747.76 is: 1,121.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.84 : 2,108.76 = 747.76 : x
  2. Step 2: Convert to fraction form
    1,405.84/2,108.76 = 747.76/x
  3. Step 3: Cross multiply
    1,405.84x = 2,108.76 × 747.76
  4. Step 4: Simplify right side
    1,405.84x = 1,576,846.38
  5. Step 5: Solve for x
    x = 1,576,846.38/1,405.84
  6. Step 6: Final answer
    x = 1,121.64

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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.