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Finding the Fourth Proportional to 909.69, 1,255.51 and 555.82

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Solution

The fourth proportional to 909.69, 1,255.51 and 555.82 is: 767.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.69 : 1,255.51 = 555.82 : x
  2. Step 2: Convert to fraction form
    909.69/1,255.51 = 555.82/x
  3. Step 3: Cross multiply
    909.69x = 1,255.51 × 555.82
  4. Step 4: Simplify right side
    909.69x = 697,835.12
  5. Step 5: Solve for x
    x = 697,835.12/909.69
  6. Step 6: Final answer
    x = 767.12

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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.