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Finding the Fourth Proportional to 7,490, 10,336.20 and 4,178

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Solution

The fourth proportional to 7,490, 10,336.20 and 4,178 is: 5,765.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,490 : 10,336.20 = 4,178 : x
  2. Step 2: Convert to fraction form
    7,490/10,336.20 = 4,178/x
  3. Step 3: Cross multiply
    7,490x = 10,336.20 × 4,178
  4. Step 4: Simplify right side
    7,490x = 43,184,643.60
  5. Step 5: Solve for x
    x = 43,184,643.60/7,490
  6. Step 6: Final answer
    x = 5,765.64

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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.