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Finding the Fourth Proportional to 38,457.60, 57,729.60 and 20,918.40

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Solution

The fourth proportional to 38,457.60, 57,729.60 and 20,918.40 is: 31,401.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,457.60 : 57,729.60 = 20,918.40 : x
  2. Step 2: Convert to fraction form
    38,457.60/57,729.60 = 20,918.40/x
  3. Step 3: Cross multiply
    38,457.60x = 57,729.60 × 20,918.40
  4. Step 4: Simplify right side
    38,457.60x = 1,207,610,864.64
  5. Step 5: Solve for x
    x = 1,207,610,864.64/38,457.60
  6. Step 6: Final answer
    x = 31,401.10

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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.