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Finding the Fourth Proportional to 12,658.10, 18,987.15 and 7,474.10

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Solution

The fourth proportional to 12,658.10, 18,987.15 and 7,474.10 is: 11,211.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.10 : 18,987.15 = 7,474.10 : x
  2. Step 2: Convert to fraction form
    12,658.10/18,987.15 = 7,474.10/x
  3. Step 3: Cross multiply
    12,658.10x = 18,987.15 × 7,474.10
  4. Step 4: Simplify right side
    12,658.10x = 141,911,857.82
  5. Step 5: Solve for x
    x = 141,911,857.82/12,658.10
  6. Step 6: Final answer
    x = 11,211.15

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1.5x scale

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.