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Finding the Fourth Proportional to 738.40, 1,107.60 and 619.60

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Solution

The fourth proportional to 738.40, 1,107.60 and 619.60 is: 929.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.40 : 1,107.60 = 619.60 : x
  2. Step 2: Convert to fraction form
    738.40/1,107.60 = 619.60/x
  3. Step 3: Cross multiply
    738.40x = 1,107.60 × 619.60
  4. Step 4: Simplify right side
    738.40x = 686,268.96
  5. Step 5: Solve for x
    x = 686,268.96/738.40
  6. Step 6: Final answer
    x = 929.40

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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.