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Finding the Fourth Proportional to 12,815.70, 17,687.40 and 7,512.64

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Solution

The fourth proportional to 12,815.70, 17,687.40 and 7,512.64 is: 10,368.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,815.70 : 17,687.40 = 7,512.64 : x
  2. Step 2: Convert to fraction form
    12,815.70/17,687.40 = 7,512.64/x
  3. Step 3: Cross multiply
    12,815.70x = 17,687.40 × 7,512.64
  4. Step 4: Simplify right side
    12,815.70x = 132,879,068.74
  5. Step 5: Solve for x
    x = 132,879,068.74/12,815.70
  6. Step 6: Final answer
    x = 10,368.46

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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.