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Finding the Fourth Proportional to 20,607.40, 28,437.78 and 13,533.40

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Solution

The fourth proportional to 20,607.40, 28,437.78 and 13,533.40 is: 18,675.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,607.40 : 28,437.78 = 13,533.40 : x
  2. Step 2: Convert to fraction form
    20,607.40/28,437.78 = 13,533.40/x
  3. Step 3: Cross multiply
    20,607.40x = 28,437.78 × 13,533.40
  4. Step 4: Simplify right side
    20,607.40x = 384,859,851.85
  5. Step 5: Solve for x
    x = 384,859,851.85/20,607.40
  6. Step 6: Final answer
    x = 18,675.81

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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.