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Finding the Fourth Proportional to 18,513.59, 25,530.08 and 13,987.40

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Solution

The fourth proportional to 18,513.59, 25,530.08 and 13,987.40 is: 19,288.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,513.59 : 25,530.08 = 13,987.40 : x
  2. Step 2: Convert to fraction form
    18,513.59/25,530.08 = 13,987.40/x
  3. Step 3: Cross multiply
    18,513.59x = 25,530.08 × 13,987.40
  4. Step 4: Simplify right side
    18,513.59x = 357,099,243.40
  5. Step 5: Solve for x
    x = 357,099,243.40/18,513.59
  6. Step 6: Final answer
    x = 19,288.50

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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.