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Finding the Fourth Proportional to 1,489.40, 2,055.12 and 859.88

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Solution

The fourth proportional to 1,489.40, 2,055.12 and 859.88 is: 1,186.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.40 : 2,055.12 = 859.88 : x
  2. Step 2: Convert to fraction form
    1,489.40/2,055.12 = 859.88/x
  3. Step 3: Cross multiply
    1,489.40x = 2,055.12 × 859.88
  4. Step 4: Simplify right side
    1,489.40x = 1,767,156.59
  5. Step 5: Solve for x
    x = 1,767,156.59/1,489.40
  6. Step 6: Final answer
    x = 1,186.49

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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.