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Finding the Fourth Proportional to 28,647.55, 39,533.02 and 15,899.98

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Solution

The fourth proportional to 28,647.55, 39,533.02 and 15,899.98 is: 21,941.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,647.55 : 39,533.02 = 15,899.98 : x
  2. Step 2: Convert to fraction form
    28,647.55/39,533.02 = 15,899.98/x
  3. Step 3: Cross multiply
    28,647.55x = 39,533.02 × 15,899.98
  4. Step 4: Simplify right side
    28,647.55x = 628,574,303.88
  5. Step 5: Solve for x
    x = 628,574,303.88/28,647.55
  6. Step 6: Final answer
    x = 21,941.64

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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.