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Finding the Fourth Proportional to 19,272, 28,918.80 and 19,125.12

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Solution

The fourth proportional to 19,272, 28,918.80 and 19,125.12 is: 28,698.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,272 : 28,918.80 = 19,125.12 : x
  2. Step 2: Convert to fraction form
    19,272/28,918.80 = 19,125.12/x
  3. Step 3: Cross multiply
    19,272x = 28,918.80 × 19,125.12
  4. Step 4: Simplify right side
    19,272x = 553,075,520.26
  5. Step 5: Solve for x
    x = 553,075,520.26/19,272
  6. Step 6: Final answer
    x = 28,698.40

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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.