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Finding the Fourth Proportional to 21,292.40, 31,938.60 and 18,700.40

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Solution

The fourth proportional to 21,292.40, 31,938.60 and 18,700.40 is: 28,050.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,292.40 : 31,938.60 = 18,700.40 : x
  2. Step 2: Convert to fraction form
    21,292.40/31,938.60 = 18,700.40/x
  3. Step 3: Cross multiply
    21,292.40x = 31,938.60 × 18,700.40
  4. Step 4: Simplify right side
    21,292.40x = 597,264,595.44
  5. Step 5: Solve for x
    x = 597,264,595.44/21,292.40
  6. Step 6: Final answer
    x = 28,050.60

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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.