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Finding the Fourth Proportional to 28,428.16, 42,643.68 and 7,651.84

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Solution

The fourth proportional to 28,428.16, 42,643.68 and 7,651.84 is: 11,478.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.16 : 42,643.68 = 7,651.84 : x
  2. Step 2: Convert to fraction form
    28,428.16/42,643.68 = 7,651.84/x
  3. Step 3: Cross multiply
    28,428.16x = 42,643.68 × 7,651.84
  4. Step 4: Simplify right side
    28,428.16x = 326,302,616.37
  5. Step 5: Solve for x
    x = 326,302,616.37/28,428.16
  6. Step 6: Final answer
    x = 11,478.15

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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.