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Finding the Fourth Proportional to 28,957.62, 39,955.32 and 21,795.06

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Solution

The fourth proportional to 28,957.62, 39,955.32 and 21,795.06 is: 30,072.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,957.62 : 39,955.32 = 21,795.06 : x
  2. Step 2: Convert to fraction form
    28,957.62/39,955.32 = 21,795.06/x
  3. Step 3: Cross multiply
    28,957.62x = 39,955.32 × 21,795.06
  4. Step 4: Simplify right side
    28,957.62x = 870,828,596.72
  5. Step 5: Solve for x
    x = 870,828,596.72/28,957.62
  6. Step 6: Final answer
    x = 30,072.52

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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.