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Finding the Fourth Proportional to 19,989, 29,981.36 and 10,619.08

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Solution

The fourth proportional to 19,989, 29,981.36 and 10,619.08 is: 15,927.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,989 : 29,981.36 = 10,619.08 : x
  2. Step 2: Convert to fraction form
    19,989/29,981.36 = 10,619.08/x
  3. Step 3: Cross multiply
    19,989x = 29,981.36 × 10,619.08
  4. Step 4: Simplify right side
    19,989x = 318,374,411.94
  5. Step 5: Solve for x
    x = 318,374,411.94/19,989
  6. Step 6: Final answer
    x = 15,927.48

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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.