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Finding the Fourth Proportional to 938.40, 1,295.36 and 619.32

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Solution

The fourth proportional to 938.40, 1,295.36 and 619.32 is: 854.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.40 : 1,295.36 = 619.32 : x
  2. Step 2: Convert to fraction form
    938.40/1,295.36 = 619.32/x
  3. Step 3: Cross multiply
    938.40x = 1,295.36 × 619.32
  4. Step 4: Simplify right side
    938.40x = 802,242.36
  5. Step 5: Solve for x
    x = 802,242.36/938.40
  6. Step 6: Final answer
    x = 854.90

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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.