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Finding the Fourth Proportional to 20,897.40, 28,830.06 and 12,934.20

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Solution

The fourth proportional to 20,897.40, 28,830.06 and 12,934.20 is: 17,844.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,897.40 : 28,830.06 = 12,934.20 : x
  2. Step 2: Convert to fraction form
    20,897.40/28,830.06 = 12,934.20/x
  3. Step 3: Cross multiply
    20,897.40x = 28,830.06 × 12,934.20
  4. Step 4: Simplify right side
    20,897.40x = 372,893,762.05
  5. Step 5: Solve for x
    x = 372,893,762.05/20,897.40
  6. Step 6: Final answer
    x = 17,844.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.