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Finding the Fourth Proportional to 1,306.72, 1,802.96 and 782.96

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Solution

The fourth proportional to 1,306.72, 1,802.96 and 782.96 is: 1,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.72 : 1,802.96 = 782.96 : x
  2. Step 2: Convert to fraction form
    1,306.72/1,802.96 = 782.96/x
  3. Step 3: Cross multiply
    1,306.72x = 1,802.96 × 782.96
  4. Step 4: Simplify right side
    1,306.72x = 1,411,645.56
  5. Step 5: Solve for x
    x = 1,411,645.56/1,306.72
  6. Step 6: Final answer
    x = 1,080.30

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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.