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Finding the Fourth Proportional to 875.34, 1,208.93 and 821.07

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Solution

The fourth proportional to 875.34, 1,208.93 and 821.07 is: 1,133.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.34 : 1,208.93 = 821.07 : x
  2. Step 2: Convert to fraction form
    875.34/1,208.93 = 821.07/x
  3. Step 3: Cross multiply
    875.34x = 1,208.93 × 821.07
  4. Step 4: Simplify right side
    875.34x = 992,612.05
  5. Step 5: Solve for x
    x = 992,612.05/875.34
  6. Step 6: Final answer
    x = 1,133.97

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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.