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Finding the Fourth Proportional to 21,989.61, 30,346.25 and 13,039.11

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Solution

The fourth proportional to 21,989.61, 30,346.25 and 13,039.11 is: 17,994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.61 : 30,346.25 = 13,039.11 : x
  2. Step 2: Convert to fraction form
    21,989.61/30,346.25 = 13,039.11/x
  3. Step 3: Cross multiply
    21,989.61x = 30,346.25 × 13,039.11
  4. Step 4: Simplify right side
    21,989.61x = 395,688,026.64
  5. Step 5: Solve for x
    x = 395,688,026.64/21,989.61
  6. Step 6: Final answer
    x = 17,994.32

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Double scale
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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.