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Finding the Fourth Proportional to 15,639.84, 21,582.81 and 8,925.12

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Solution

The fourth proportional to 15,639.84, 21,582.81 and 8,925.12 is: 12,316.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,639.84 : 21,582.81 = 8,925.12 : x
  2. Step 2: Convert to fraction form
    15,639.84/21,582.81 = 8,925.12/x
  3. Step 3: Cross multiply
    15,639.84x = 21,582.81 × 8,925.12
  4. Step 4: Simplify right side
    15,639.84x = 192,629,169.19
  5. Step 5: Solve for x
    x = 192,629,169.19/15,639.84
  6. Step 6: Final answer
    x = 12,316.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.