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Finding the Fourth Proportional to 858.71, 1,185.02 and 465.74

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Solution

The fourth proportional to 858.71, 1,185.02 and 465.74 is: 642.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.71 : 1,185.02 = 465.74 : x
  2. Step 2: Convert to fraction form
    858.71/1,185.02 = 465.74/x
  3. Step 3: Cross multiply
    858.71x = 1,185.02 × 465.74
  4. Step 4: Simplify right side
    858.71x = 551,906.45
  5. Step 5: Solve for x
    x = 551,906.45/858.71
  6. Step 6: Final answer
    x = 642.72

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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.