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Finding the Fourth Proportional to 13,603.60, 20,405.40 and 11,875.60

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Solution

The fourth proportional to 13,603.60, 20,405.40 and 11,875.60 is: 17,813.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.60 : 20,405.40 = 11,875.60 : x
  2. Step 2: Convert to fraction form
    13,603.60/20,405.40 = 11,875.60/x
  3. Step 3: Cross multiply
    13,603.60x = 20,405.40 × 11,875.60
  4. Step 4: Simplify right side
    13,603.60x = 242,326,368.24
  5. Step 5: Solve for x
    x = 242,326,368.24/13,603.60
  6. Step 6: Final answer
    x = 17,813.40

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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.