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Finding the Fourth Proportional to 28,461.78, 42,692.76 and 12,861.18

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Solution

The fourth proportional to 28,461.78, 42,692.76 and 12,861.18 is: 19,291.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,461.78 : 42,692.76 = 12,861.18 : x
  2. Step 2: Convert to fraction form
    28,461.78/42,692.76 = 12,861.18/x
  3. Step 3: Cross multiply
    28,461.78x = 42,692.76 × 12,861.18
  4. Step 4: Simplify right side
    28,461.78x = 549,079,271.06
  5. Step 5: Solve for x
    x = 549,079,271.06/28,461.78
  6. Step 6: Final answer
    x = 19,291.81

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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.