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Finding the Fourth Proportional to 19,618.36, 29,428.98 and 7,931.32

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Solution

The fourth proportional to 19,618.36, 29,428.98 and 7,931.32 is: 11,897.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,618.36 : 29,428.98 = 7,931.32 : x
  2. Step 2: Convert to fraction form
    19,618.36/29,428.98 = 7,931.32/x
  3. Step 3: Cross multiply
    19,618.36x = 29,428.98 × 7,931.32
  4. Step 4: Simplify right side
    19,618.36x = 233,410,657.65
  5. Step 5: Solve for x
    x = 233,410,657.65/19,618.36
  6. Step 6: Final answer
    x = 11,897.56

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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.