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Finding the Fourth Proportional to 1,270.29, 1,903.35 and 782.31

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Solution

The fourth proportional to 1,270.29, 1,903.35 and 782.31 is: 1,172.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.29 : 1,903.35 = 782.31 : x
  2. Step 2: Convert to fraction form
    1,270.29/1,903.35 = 782.31/x
  3. Step 3: Cross multiply
    1,270.29x = 1,903.35 × 782.31
  4. Step 4: Simplify right side
    1,270.29x = 1,489,009.74
  5. Step 5: Solve for x
    x = 1,489,009.74/1,270.29
  6. Step 6: Final answer
    x = 1,172.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.