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Finding the Fourth Proportional to 15,075.40, 20,800.73 and 8,700.64

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Solution

The fourth proportional to 15,075.40, 20,800.73 and 8,700.64 is: 12,004.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,075.40 : 20,800.73 = 8,700.64 : x
  2. Step 2: Convert to fraction form
    15,075.40/20,800.73 = 8,700.64/x
  3. Step 3: Cross multiply
    15,075.40x = 20,800.73 × 8,700.64
  4. Step 4: Simplify right side
    15,075.40x = 180,979,678.59
  5. Step 5: Solve for x
    x = 180,979,678.59/15,075.40
  6. Step 6: Final answer
    x = 12,004.96

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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.