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Finding the Fourth Proportional to 19,386.40, 29,090.40 and 8,291.20

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Solution

The fourth proportional to 19,386.40, 29,090.40 and 8,291.20 is: 12,441.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,386.40 : 29,090.40 = 8,291.20 : x
  2. Step 2: Convert to fraction form
    19,386.40/29,090.40 = 8,291.20/x
  3. Step 3: Cross multiply
    19,386.40x = 29,090.40 × 8,291.20
  4. Step 4: Simplify right side
    19,386.40x = 241,194,324.48
  5. Step 5: Solve for x
    x = 241,194,324.48/19,386.40
  6. Step 6: Final answer
    x = 12,441.42

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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.