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Finding the Fourth Proportional to 20,888.69, 28,827.90 and 11,457.45

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Solution

The fourth proportional to 20,888.69, 28,827.90 and 11,457.45 is: 15,812.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.69 : 28,827.90 = 11,457.45 : x
  2. Step 2: Convert to fraction form
    20,888.69/28,827.90 = 11,457.45/x
  3. Step 3: Cross multiply
    20,888.69x = 28,827.90 × 11,457.45
  4. Step 4: Simplify right side
    20,888.69x = 330,294,222.86
  5. Step 5: Solve for x
    x = 330,294,222.86/20,888.69
  6. Step 6: Final answer
    x = 15,812.11

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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.