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Finding the Fourth Proportional to 875.75, 1,209.02 and 581.42

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Solution

The fourth proportional to 875.75, 1,209.02 and 581.42 is: 802.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.75 : 1,209.02 = 581.42 : x
  2. Step 2: Convert to fraction form
    875.75/1,209.02 = 581.42/x
  3. Step 3: Cross multiply
    875.75x = 1,209.02 × 581.42
  4. Step 4: Simplify right side
    875.75x = 702,943.82
  5. Step 5: Solve for x
    x = 702,943.82/875.75
  6. Step 6: Final answer
    x = 802.68

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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.