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Finding the Fourth Proportional to 18,941.81, 28,412.76 and 5,090.81

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Solution

The fourth proportional to 18,941.81, 28,412.76 and 5,090.81 is: 7,636.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,941.81 : 28,412.76 = 5,090.81 : x
  2. Step 2: Convert to fraction form
    18,941.81/28,412.76 = 5,090.81/x
  3. Step 3: Cross multiply
    18,941.81x = 28,412.76 × 5,090.81
  4. Step 4: Simplify right side
    18,941.81x = 144,643,962.74
  5. Step 5: Solve for x
    x = 144,643,962.74/18,941.81
  6. Step 6: Final answer
    x = 7,636.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.