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Finding the Fourth Proportional to 859.51, 1,289.25 and 210.25

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Solution

The fourth proportional to 859.51, 1,289.25 and 210.25 is: 315.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.51 : 1,289.25 = 210.25 : x
  2. Step 2: Convert to fraction form
    859.51/1,289.25 = 210.25/x
  3. Step 3: Cross multiply
    859.51x = 1,289.25 × 210.25
  4. Step 4: Simplify right side
    859.51x = 271,061.59
  5. Step 5: Solve for x
    x = 271,061.59/859.51
  6. Step 6: Final answer
    x = 315.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.