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Finding the Fourth Proportional to 1,259.80, 1,737.42 and 979.60

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Solution

The fourth proportional to 1,259.80, 1,737.42 and 979.60 is: 1,350.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.80 : 1,737.42 = 979.60 : x
  2. Step 2: Convert to fraction form
    1,259.80/1,737.42 = 979.60/x
  3. Step 3: Cross multiply
    1,259.80x = 1,737.42 × 979.60
  4. Step 4: Simplify right side
    1,259.80x = 1,701,976.63
  5. Step 5: Solve for x
    x = 1,701,976.63/1,259.80
  6. Step 6: Final answer
    x = 1,350.99

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1.5x scale

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.