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Finding the Fourth Proportional to 858.74, 1,185.18 and 637.34

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Solution

The fourth proportional to 858.74, 1,185.18 and 637.34 is: 879.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.74 : 1,185.18 = 637.34 : x
  2. Step 2: Convert to fraction form
    858.74/1,185.18 = 637.34/x
  3. Step 3: Cross multiply
    858.74x = 1,185.18 × 637.34
  4. Step 4: Simplify right side
    858.74x = 755,362.62
  5. Step 5: Solve for x
    x = 755,362.62/858.74
  6. Step 6: Final answer
    x = 879.62

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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.