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Finding the Fourth Proportional to 920.70, 1,269.70 and 710.54

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Solution

The fourth proportional to 920.70, 1,269.70 and 710.54 is: 979.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.70 : 1,269.70 = 710.54 : x
  2. Step 2: Convert to fraction form
    920.70/1,269.70 = 710.54/x
  3. Step 3: Cross multiply
    920.70x = 1,269.70 × 710.54
  4. Step 4: Simplify right side
    920.70x = 902,172.64
  5. Step 5: Solve for x
    x = 902,172.64/920.70
  6. Step 6: Final answer
    x = 979.88

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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.