Home / 28,289.84-39,038.94-15,715.40

Finding the Fourth Proportional to 28,289.84, 39,038.94 and 15,715.40

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Solution

The fourth proportional to 28,289.84, 39,038.94 and 15,715.40 is: 21,686.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,289.84 : 39,038.94 = 15,715.40 : x
  2. Step 2: Convert to fraction form
    28,289.84/39,038.94 = 15,715.40/x
  3. Step 3: Cross multiply
    28,289.84x = 39,038.94 × 15,715.40
  4. Step 4: Simplify right side
    28,289.84x = 613,512,557.68
  5. Step 5: Solve for x
    x = 613,512,557.68/28,289.84
  6. Step 6: Final answer
    x = 21,686.67

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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.