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Finding the Fourth Proportional to 9,135.45, 12,815.55 and 9,135.45

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Solution

The fourth proportional to 9,135.45, 12,815.55 and 9,135.45 is: 12,815.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,135.45 : 12,815.55 = 9,135.45 : x
  2. Step 2: Convert to fraction form
    9,135.45/12,815.55 = 9,135.45/x
  3. Step 3: Cross multiply
    9,135.45x = 12,815.55 × 9,135.45
  4. Step 4: Simplify right side
    9,135.45x = 117,075,816.25
  5. Step 5: Solve for x
    x = 117,075,816.25/9,135.45
  6. Step 6: Final answer
    x = 12,815.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.