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Finding the Fourth Proportional to 28,215, 42,317.62 and 13,223.64

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Solution

The fourth proportional to 28,215, 42,317.62 and 13,223.64 is: 19,833.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,215 : 42,317.62 = 13,223.64 : x
  2. Step 2: Convert to fraction form
    28,215/42,317.62 = 13,223.64/x
  3. Step 3: Cross multiply
    28,215x = 42,317.62 × 13,223.64
  4. Step 4: Simplify right side
    28,215x = 559,592,972.54
  5. Step 5: Solve for x
    x = 559,592,972.54/28,215
  6. Step 6: Final answer
    x = 19,833.17

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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.