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Finding the Fourth Proportional to 1,287.30, 1,776.56 and 783.35

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Solution

The fourth proportional to 1,287.30, 1,776.56 and 783.35 is: 1,081.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.30 : 1,776.56 = 783.35 : x
  2. Step 2: Convert to fraction form
    1,287.30/1,776.56 = 783.35/x
  3. Step 3: Cross multiply
    1,287.30x = 1,776.56 × 783.35
  4. Step 4: Simplify right side
    1,287.30x = 1,391,655.48
  5. Step 5: Solve for x
    x = 1,391,655.48/1,287.30
  6. Step 6: Final answer
    x = 1,081.07

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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.