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Finding the Fourth Proportional to 1,287.04, 1,918.18 and 1,276.32

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Solution

The fourth proportional to 1,287.04, 1,918.18 and 1,276.32 is: 1,902.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.04 : 1,918.18 = 1,276.32 : x
  2. Step 2: Convert to fraction form
    1,287.04/1,918.18 = 1,276.32/x
  3. Step 3: Cross multiply
    1,287.04x = 1,918.18 × 1,276.32
  4. Step 4: Simplify right side
    1,287.04x = 2,448,211.50
  5. Step 5: Solve for x
    x = 2,448,211.50/1,287.04
  6. Step 6: Final answer
    x = 1,902.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.