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Finding the Fourth Proportional to 741.40, 1,021.39 and 614.89

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Solution

The fourth proportional to 741.40, 1,021.39 and 614.89 is: 847.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.40 : 1,021.39 = 614.89 : x
  2. Step 2: Convert to fraction form
    741.40/1,021.39 = 614.89/x
  3. Step 3: Cross multiply
    741.40x = 1,021.39 × 614.89
  4. Step 4: Simplify right side
    741.40x = 628,042.50
  5. Step 5: Solve for x
    x = 628,042.50/741.40
  6. Step 6: Final answer
    x = 847.10

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1.5x scale

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.