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Finding the Fourth Proportional to 21,783.64, 30,070.60 and 14,719.60

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Solution

The fourth proportional to 21,783.64, 30,070.60 and 14,719.60 is: 20,319.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,783.64 : 30,070.60 = 14,719.60 : x
  2. Step 2: Convert to fraction form
    21,783.64/30,070.60 = 14,719.60/x
  3. Step 3: Cross multiply
    21,783.64x = 30,070.60 × 14,719.60
  4. Step 4: Simplify right side
    21,783.64x = 442,627,203.76
  5. Step 5: Solve for x
    x = 442,627,203.76/21,783.64
  6. Step 6: Final answer
    x = 20,319.25

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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.