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Finding the Fourth Proportional to 28,356, 42,534.36 and 9,888

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Solution

The fourth proportional to 28,356, 42,534.36 and 9,888 is: 14,832.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356 : 42,534.36 = 9,888 : x
  2. Step 2: Convert to fraction form
    28,356/42,534.36 = 9,888/x
  3. Step 3: Cross multiply
    28,356x = 42,534.36 × 9,888
  4. Step 4: Simplify right side
    28,356x = 420,579,751.68
  5. Step 5: Solve for x
    x = 420,579,751.68/28,356
  6. Step 6: Final answer
    x = 14,832.13

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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.