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Finding the Fourth Proportional to 21,000.60, 31,500.90 and 18,813.60

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Solution

The fourth proportional to 21,000.60, 31,500.90 and 18,813.60 is: 28,220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.60 : 31,500.90 = 18,813.60 : x
  2. Step 2: Convert to fraction form
    21,000.60/31,500.90 = 18,813.60/x
  3. Step 3: Cross multiply
    21,000.60x = 31,500.90 × 18,813.60
  4. Step 4: Simplify right side
    21,000.60x = 592,645,332.24
  5. Step 5: Solve for x
    x = 592,645,332.24/21,000.60
  6. Step 6: Final answer
    x = 28,220.40

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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.