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Finding the Fourth Proportional to 859.19, 1,185.70 and 466.21

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Solution

The fourth proportional to 859.19, 1,185.70 and 466.21 is: 643.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.19 : 1,185.70 = 466.21 : x
  2. Step 2: Convert to fraction form
    859.19/1,185.70 = 466.21/x
  3. Step 3: Cross multiply
    859.19x = 1,185.70 × 466.21
  4. Step 4: Simplify right side
    859.19x = 552,784.16
  5. Step 5: Solve for x
    x = 552,784.16/859.19
  6. Step 6: Final answer
    x = 643.38

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Double scale
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1.5x scale

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.