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Finding the Fourth Proportional to 21,360.40, 32,040.60 and 13,603.60

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Solution

The fourth proportional to 21,360.40, 32,040.60 and 13,603.60 is: 20,405.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,360.40 : 32,040.60 = 13,603.60 : x
  2. Step 2: Convert to fraction form
    21,360.40/32,040.60 = 13,603.60/x
  3. Step 3: Cross multiply
    21,360.40x = 32,040.60 × 13,603.60
  4. Step 4: Simplify right side
    21,360.40x = 435,867,506.16
  5. Step 5: Solve for x
    x = 435,867,506.16/21,360.40
  6. Step 6: Final answer
    x = 20,405.40

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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.