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Finding the Fourth Proportional to 858.63, 1,184.91 and 465.66

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Solution

The fourth proportional to 858.63, 1,184.91 and 465.66 is: 642.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.63 : 1,184.91 = 465.66 : x
  2. Step 2: Convert to fraction form
    858.63/1,184.91 = 465.66/x
  3. Step 3: Cross multiply
    858.63x = 1,184.91 × 465.66
  4. Step 4: Simplify right side
    858.63x = 551,758.10
  5. Step 5: Solve for x
    x = 551,758.10/858.63
  6. Step 6: Final answer
    x = 642.60

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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.