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Finding the Fourth Proportional to 875.09, 1,206.73 and 639.07

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Solution

The fourth proportional to 875.09, 1,206.73 and 639.07 is: 881.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.09 : 1,206.73 = 639.07 : x
  2. Step 2: Convert to fraction form
    875.09/1,206.73 = 639.07/x
  3. Step 3: Cross multiply
    875.09x = 1,206.73 × 639.07
  4. Step 4: Simplify right side
    875.09x = 771,180.33
  5. Step 5: Solve for x
    x = 771,180.33/875.09
  6. Step 6: Final answer
    x = 881.26

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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.