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Finding the Fourth Proportional to 747.79, 1,121.78 and 455.51

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Solution

The fourth proportional to 747.79, 1,121.78 and 455.51 is: 683.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.79 : 1,121.78 = 455.51 : x
  2. Step 2: Convert to fraction form
    747.79/1,121.78 = 455.51/x
  3. Step 3: Cross multiply
    747.79x = 1,121.78 × 455.51
  4. Step 4: Simplify right side
    747.79x = 510,985.95
  5. Step 5: Solve for x
    x = 510,985.95/747.79
  6. Step 6: Final answer
    x = 683.33

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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.