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Finding the Fourth Proportional to 1,259.60, 1,738.86 and 840.20

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Solution

The fourth proportional to 1,259.60, 1,738.86 and 840.20 is: 1,159.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.60 : 1,738.86 = 840.20 : x
  2. Step 2: Convert to fraction form
    1,259.60/1,738.86 = 840.20/x
  3. Step 3: Cross multiply
    1,259.60x = 1,738.86 × 840.20
  4. Step 4: Simplify right side
    1,259.60x = 1,460,990.17
  5. Step 5: Solve for x
    x = 1,460,990.17/1,259.60
  6. Step 6: Final answer
    x = 1,159.88

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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.