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Finding the Fourth Proportional to 30,689.78, 46,019.90 and 18,211.40

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Solution

The fourth proportional to 30,689.78, 46,019.90 and 18,211.40 is: 27,308.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,689.78 : 46,019.90 = 18,211.40 : x
  2. Step 2: Convert to fraction form
    30,689.78/46,019.90 = 18,211.40/x
  3. Step 3: Cross multiply
    30,689.78x = 46,019.90 × 18,211.40
  4. Step 4: Simplify right side
    30,689.78x = 838,086,806.86
  5. Step 5: Solve for x
    x = 838,086,806.86/30,689.78
  6. Step 6: Final answer
    x = 27,308.34

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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.