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Finding the Fourth Proportional to 620.70, 929.70 and 512.70

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Solution

The fourth proportional to 620.70, 929.70 and 512.70 is: 767.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.70 : 929.70 = 512.70 : x
  2. Step 2: Convert to fraction form
    620.70/929.70 = 512.70/x
  3. Step 3: Cross multiply
    620.70x = 929.70 × 512.70
  4. Step 4: Simplify right side
    620.70x = 476,657.19
  5. Step 5: Solve for x
    x = 476,657.19/620.70
  6. Step 6: Final answer
    x = 767.93

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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.