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Finding the Fourth Proportional to 1,707.78, 2,356.74 and 1,009.20

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Solution

The fourth proportional to 1,707.78, 2,356.74 and 1,009.20 is: 1,392.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,707.78 : 2,356.74 = 1,009.20 : x
  2. Step 2: Convert to fraction form
    1,707.78/2,356.74 = 1,009.20/x
  3. Step 3: Cross multiply
    1,707.78x = 2,356.74 × 1,009.20
  4. Step 4: Simplify right side
    1,707.78x = 2,378,422.01
  5. Step 5: Solve for x
    x = 2,378,422.01/1,707.78
  6. Step 6: Final answer
    x = 1,392.70

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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.