Home / 28,521.81-39,318.90-19,555.11

Finding the Fourth Proportional to 28,521.81, 39,318.90 and 19,555.11

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Solution

The fourth proportional to 28,521.81, 39,318.90 and 19,555.11 is: 26,957.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,521.81 : 39,318.90 = 19,555.11 : x
  2. Step 2: Convert to fraction form
    28,521.81/39,318.90 = 19,555.11/x
  3. Step 3: Cross multiply
    28,521.81x = 39,318.90 × 19,555.11
  4. Step 4: Simplify right side
    28,521.81x = 768,885,414.58
  5. Step 5: Solve for x
    x = 768,885,414.58/28,521.81
  6. Step 6: Final answer
    x = 26,957.81

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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.