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Finding the Fourth Proportional to 18,655.12, 25,745.88 and 13,931.20

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Solution

The fourth proportional to 18,655.12, 25,745.88 and 13,931.20 is: 19,226.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,655.12 : 25,745.88 = 13,931.20 : x
  2. Step 2: Convert to fraction form
    18,655.12/25,745.88 = 13,931.20/x
  3. Step 3: Cross multiply
    18,655.12x = 25,745.88 × 13,931.20
  4. Step 4: Simplify right side
    18,655.12x = 358,671,003.46
  5. Step 5: Solve for x
    x = 358,671,003.46/18,655.12
  6. Step 6: Final answer
    x = 19,226.41

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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.