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Finding the Fourth Proportional to 28,146.96, 42,210.96 and 9,421.44

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Solution

The fourth proportional to 28,146.96, 42,210.96 and 9,421.44 is: 14,128.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,146.96 : 42,210.96 = 9,421.44 : x
  2. Step 2: Convert to fraction form
    28,146.96/42,210.96 = 9,421.44/x
  3. Step 3: Cross multiply
    28,146.96x = 42,210.96 × 9,421.44
  4. Step 4: Simplify right side
    28,146.96x = 397,688,026.98
  5. Step 5: Solve for x
    x = 397,688,026.98/28,146.96
  6. Step 6: Final answer
    x = 14,128.99

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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.