Home / 20,487.79-28,271.41-11,533.65

Finding the Fourth Proportional to 20,487.79, 28,271.41 and 11,533.65

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Solution

The fourth proportional to 20,487.79, 28,271.41 and 11,533.65 is: 15,915.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.79 : 28,271.41 = 11,533.65 : x
  2. Step 2: Convert to fraction form
    20,487.79/28,271.41 = 11,533.65/x
  3. Step 3: Cross multiply
    20,487.79x = 28,271.41 × 11,533.65
  4. Step 4: Simplify right side
    20,487.79x = 326,072,547.95
  5. Step 5: Solve for x
    x = 326,072,547.95/20,487.79
  6. Step 6: Final answer
    x = 15,915.46

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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.