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Finding the Fourth Proportional to 855.77, 1,289.47 and 705.05

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Solution

The fourth proportional to 855.77, 1,289.47 and 705.05 is: 1,062.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.77 : 1,289.47 = 705.05 : x
  2. Step 2: Convert to fraction form
    855.77/1,289.47 = 705.05/x
  3. Step 3: Cross multiply
    855.77x = 1,289.47 × 705.05
  4. Step 4: Simplify right side
    855.77x = 909,146.02
  5. Step 5: Solve for x
    x = 909,146.02/855.77
  6. Step 6: Final answer
    x = 1,062.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.