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Finding the Fourth Proportional to 858.81, 1,185.15 and 465.81

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Solution

The fourth proportional to 858.81, 1,185.15 and 465.81 is: 642.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.81 : 1,185.15 = 465.81 : x
  2. Step 2: Convert to fraction form
    858.81/1,185.15 = 465.81/x
  3. Step 3: Cross multiply
    858.81x = 1,185.15 × 465.81
  4. Step 4: Simplify right side
    858.81x = 552,054.72
  5. Step 5: Solve for x
    x = 552,054.72/858.81
  6. Step 6: Final answer
    x = 642.81

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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.