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Finding the Fourth Proportional to 875.34, 1,208.79 and 788.94

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Solution

The fourth proportional to 875.34, 1,208.79 and 788.94 is: 1,089.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.34 : 1,208.79 = 788.94 : x
  2. Step 2: Convert to fraction form
    875.34/1,208.79 = 788.94/x
  3. Step 3: Cross multiply
    875.34x = 1,208.79 × 788.94
  4. Step 4: Simplify right side
    875.34x = 953,662.78
  5. Step 5: Solve for x
    x = 953,662.78/875.34
  6. Step 6: Final answer
    x = 1,089.48

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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.