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Finding the Fourth Proportional to 929.78, 1,392.93 and 620.72

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Solution

The fourth proportional to 929.78, 1,392.93 and 620.72 is: 929.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.78 : 1,392.93 = 620.72 : x
  2. Step 2: Convert to fraction form
    929.78/1,392.93 = 620.72/x
  3. Step 3: Cross multiply
    929.78x = 1,392.93 × 620.72
  4. Step 4: Simplify right side
    929.78x = 864,619.51
  5. Step 5: Solve for x
    x = 864,619.51/929.78
  6. Step 6: Final answer
    x = 929.92

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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.