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Finding the Fourth Proportional to 30,486.60, 42,064.20 and 18,392.76

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Solution

The fourth proportional to 30,486.60, 42,064.20 and 18,392.76 is: 25,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,486.60 : 42,064.20 = 18,392.76 : x
  2. Step 2: Convert to fraction form
    30,486.60/42,064.20 = 18,392.76/x
  3. Step 3: Cross multiply
    30,486.60x = 42,064.20 × 18,392.76
  4. Step 4: Simplify right side
    30,486.60x = 773,676,735.19
  5. Step 5: Solve for x
    x = 773,676,735.19/30,486.60
  6. Step 6: Final answer
    x = 25,377.60

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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.