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Finding the Fourth Proportional to 28,099.12, 42,148.68 and 7,321

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Solution

The fourth proportional to 28,099.12, 42,148.68 and 7,321 is: 10,981.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,099.12 : 42,148.68 = 7,321 : x
  2. Step 2: Convert to fraction form
    28,099.12/42,148.68 = 7,321/x
  3. Step 3: Cross multiply
    28,099.12x = 42,148.68 × 7,321
  4. Step 4: Simplify right side
    28,099.12x = 308,570,486.28
  5. Step 5: Solve for x
    x = 308,570,486.28/28,099.12
  6. Step 6: Final answer
    x = 10,981.50

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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.