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Finding the Fourth Proportional to 1,489.66, 2,055.78 and 900.23

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Solution

The fourth proportional to 1,489.66, 2,055.78 and 900.23 is: 1,242.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.66 : 2,055.78 = 900.23 : x
  2. Step 2: Convert to fraction form
    1,489.66/2,055.78 = 900.23/x
  3. Step 3: Cross multiply
    1,489.66x = 2,055.78 × 900.23
  4. Step 4: Simplify right side
    1,489.66x = 1,850,664.55
  5. Step 5: Solve for x
    x = 1,850,664.55/1,489.66
  6. Step 6: Final answer
    x = 1,242.34

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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.