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Finding the Fourth Proportional to 39,980.40, 59,905.20 and 13,670.88

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Solution

The fourth proportional to 39,980.40, 59,905.20 and 13,670.88 is: 20,483.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,980.40 : 59,905.20 = 13,670.88 : x
  2. Step 2: Convert to fraction form
    39,980.40/59,905.20 = 13,670.88/x
  3. Step 3: Cross multiply
    39,980.40x = 59,905.20 × 13,670.88
  4. Step 4: Simplify right side
    39,980.40x = 818,956,800.58
  5. Step 5: Solve for x
    x = 818,956,800.58/39,980.40
  6. Step 6: Final answer
    x = 20,483.96

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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.