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Finding the Fourth Proportional to 12,900.40, 19,307.40 and 11,345.20

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Solution

The fourth proportional to 12,900.40, 19,307.40 and 11,345.20 is: 16,979.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,900.40 : 19,307.40 = 11,345.20 : x
  2. Step 2: Convert to fraction form
    12,900.40/19,307.40 = 11,345.20/x
  3. Step 3: Cross multiply
    12,900.40x = 19,307.40 × 11,345.20
  4. Step 4: Simplify right side
    12,900.40x = 219,046,314.48
  5. Step 5: Solve for x
    x = 219,046,314.48/12,900.40
  6. Step 6: Final answer
    x = 16,979.81

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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.