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Finding the Fourth Proportional to 1,307.28, 1,804.20 and 783.31

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Solution

The fourth proportional to 1,307.28, 1,804.20 and 783.31 is: 1,081.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.28 : 1,804.20 = 783.31 : x
  2. Step 2: Convert to fraction form
    1,307.28/1,804.20 = 783.31/x
  3. Step 3: Cross multiply
    1,307.28x = 1,804.20 × 783.31
  4. Step 4: Simplify right side
    1,307.28x = 1,413,247.90
  5. Step 5: Solve for x
    x = 1,413,247.90/1,307.28
  6. Step 6: Final answer
    x = 1,081.06

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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.