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Finding the Fourth Proportional to 959.61, 1,439.82 and 570.36

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Solution

The fourth proportional to 959.61, 1,439.82 and 570.36 is: 855.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.61 : 1,439.82 = 570.36 : x
  2. Step 2: Convert to fraction form
    959.61/1,439.82 = 570.36/x
  3. Step 3: Cross multiply
    959.61x = 1,439.82 × 570.36
  4. Step 4: Simplify right side
    959.61x = 821,211.41
  5. Step 5: Solve for x
    x = 821,211.41/959.61
  6. Step 6: Final answer
    x = 855.78

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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.