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Finding the Fourth Proportional to 855, 1,180.47 and 655.47

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Solution

The fourth proportional to 855, 1,180.47 and 655.47 is: 904.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    855 : 1,180.47 = 655.47 : x
  2. Step 2: Convert to fraction form
    855/1,180.47 = 655.47/x
  3. Step 3: Cross multiply
    855x = 1,180.47 × 655.47
  4. Step 4: Simplify right side
    855x = 773,762.67
  5. Step 5: Solve for x
    x = 773,762.67/855
  6. Step 6: Final answer
    x = 904.99

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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.