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Finding the Fourth Proportional to 1,489.08, 2,055.03 and 859.72

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Solution

The fourth proportional to 1,489.08, 2,055.03 and 859.72 is: 1,186.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.08 : 2,055.03 = 859.72 : x
  2. Step 2: Convert to fraction form
    1,489.08/2,055.03 = 859.72/x
  3. Step 3: Cross multiply
    1,489.08x = 2,055.03 × 859.72
  4. Step 4: Simplify right side
    1,489.08x = 1,766,750.39
  5. Step 5: Solve for x
    x = 1,766,750.39/1,489.08
  6. Step 6: Final answer
    x = 1,186.47

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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.