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Finding the Fourth Proportional to 21,328.80, 31,993.20 and 14,330.40

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Solution

The fourth proportional to 21,328.80, 31,993.20 and 14,330.40 is: 21,495.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,328.80 : 31,993.20 = 14,330.40 : x
  2. Step 2: Convert to fraction form
    21,328.80/31,993.20 = 14,330.40/x
  3. Step 3: Cross multiply
    21,328.80x = 31,993.20 × 14,330.40
  4. Step 4: Simplify right side
    21,328.80x = 458,475,353.28
  5. Step 5: Solve for x
    x = 458,475,353.28/21,328.80
  6. Step 6: Final answer
    x = 21,495.60

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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.