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Finding the Fourth Proportional to 1,373.28, 1,895.20 and 783.84

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Solution

The fourth proportional to 1,373.28, 1,895.20 and 783.84 is: 1,081.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.28 : 1,895.20 = 783.84 : x
  2. Step 2: Convert to fraction form
    1,373.28/1,895.20 = 783.84/x
  3. Step 3: Cross multiply
    1,373.28x = 1,895.20 × 783.84
  4. Step 4: Simplify right side
    1,373.28x = 1,485,533.57
  5. Step 5: Solve for x
    x = 1,485,533.57/1,373.28
  6. Step 6: Final answer
    x = 1,081.74

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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.