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Finding the Fourth Proportional to 749.47, 1,124.20 and 620.95

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Solution

The fourth proportional to 749.47, 1,124.20 and 620.95 is: 931.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.47 : 1,124.20 = 620.95 : x
  2. Step 2: Convert to fraction form
    749.47/1,124.20 = 620.95/x
  3. Step 3: Cross multiply
    749.47x = 1,124.20 × 620.95
  4. Step 4: Simplify right side
    749.47x = 698,071.99
  5. Step 5: Solve for x
    x = 698,071.99/749.47
  6. Step 6: Final answer
    x = 931.42

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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.