Home / 20,666.24-28,510.72-12,278.40

Finding the Fourth Proportional to 20,666.24, 28,510.72 and 12,278.40

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Solution

The fourth proportional to 20,666.24, 28,510.72 and 12,278.40 is: 16,939.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.24 : 28,510.72 = 12,278.40 : x
  2. Step 2: Convert to fraction form
    20,666.24/28,510.72 = 12,278.40/x
  3. Step 3: Cross multiply
    20,666.24x = 28,510.72 × 12,278.40
  4. Step 4: Simplify right side
    20,666.24x = 350,066,024.45
  5. Step 5: Solve for x
    x = 350,066,024.45/20,666.24
  6. Step 6: Final answer
    x = 16,939.03

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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.