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Finding the Fourth Proportional to 929.60, 1,394.40 and 620.45

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Solution

The fourth proportional to 929.60, 1,394.40 and 620.45 is: 930.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.60 : 1,394.40 = 620.45 : x
  2. Step 2: Convert to fraction form
    929.60/1,394.40 = 620.45/x
  3. Step 3: Cross multiply
    929.60x = 1,394.40 × 620.45
  4. Step 4: Simplify right side
    929.60x = 865,155.48
  5. Step 5: Solve for x
    x = 865,155.48/929.60
  6. Step 6: Final answer
    x = 930.68

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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.