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Finding the Fourth Proportional to 875.90, 1,313.91 and 290.88

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Solution

The fourth proportional to 875.90, 1,313.91 and 290.88 is: 436.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.90 : 1,313.91 = 290.88 : x
  2. Step 2: Convert to fraction form
    875.90/1,313.91 = 290.88/x
  3. Step 3: Cross multiply
    875.90x = 1,313.91 × 290.88
  4. Step 4: Simplify right side
    875.90x = 382,190.14
  5. Step 5: Solve for x
    x = 382,190.14/875.90
  6. Step 6: Final answer
    x = 436.34

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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.