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Finding the Fourth Proportional to 28,271.70, 42,407.55 and 7,211.70

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Solution

The fourth proportional to 28,271.70, 42,407.55 and 7,211.70 is: 10,817.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,271.70 : 42,407.55 = 7,211.70 : x
  2. Step 2: Convert to fraction form
    28,271.70/42,407.55 = 7,211.70/x
  3. Step 3: Cross multiply
    28,271.70x = 42,407.55 × 7,211.70
  4. Step 4: Simplify right side
    28,271.70x = 305,830,528.34
  5. Step 5: Solve for x
    x = 305,830,528.34/28,271.70
  6. Step 6: Final answer
    x = 10,817.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.