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Finding the Fourth Proportional to 875.61, 1,313.33 and 290.61

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Solution

The fourth proportional to 875.61, 1,313.33 and 290.61 is: 435.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.61 : 1,313.33 = 290.61 : x
  2. Step 2: Convert to fraction form
    875.61/1,313.33 = 290.61/x
  3. Step 3: Cross multiply
    875.61x = 1,313.33 × 290.61
  4. Step 4: Simplify right side
    875.61x = 381,666.83
  5. Step 5: Solve for x
    x = 381,666.83/875.61
  6. Step 6: Final answer
    x = 435.89

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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.