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Finding the Fourth Proportional to 857.19, 1,182.91 and 464.21

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Solution

The fourth proportional to 857.19, 1,182.91 and 464.21 is: 640.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.19 : 1,182.91 = 464.21 : x
  2. Step 2: Convert to fraction form
    857.19/1,182.91 = 464.21/x
  3. Step 3: Cross multiply
    857.19x = 1,182.91 × 464.21
  4. Step 4: Simplify right side
    857.19x = 549,118.65
  5. Step 5: Solve for x
    x = 549,118.65/857.19
  6. Step 6: Final answer
    x = 640.60

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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.