Home / 20,678.27-28,536.32-12,715.79

Finding the Fourth Proportional to 20,678.27, 28,536.32 and 12,715.79

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Solution

The fourth proportional to 20,678.27, 28,536.32 and 12,715.79 is: 17,547.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,678.27 : 28,536.32 = 12,715.79 : x
  2. Step 2: Convert to fraction form
    20,678.27/28,536.32 = 12,715.79/x
  3. Step 3: Cross multiply
    20,678.27x = 28,536.32 × 12,715.79
  4. Step 4: Simplify right side
    20,678.27x = 362,861,852.49
  5. Step 5: Solve for x
    x = 362,861,852.49/20,678.27
  6. Step 6: Final answer
    x = 17,547.98

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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.