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Finding the Fourth Proportional to 30,698.63, 42,369.91 and 19,218.88

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Solution

The fourth proportional to 30,698.63, 42,369.91 and 19,218.88 is: 26,525.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,698.63 : 42,369.91 = 19,218.88 : x
  2. Step 2: Convert to fraction form
    30,698.63/42,369.91 = 19,218.88/x
  3. Step 3: Cross multiply
    30,698.63x = 42,369.91 × 19,218.88
  4. Step 4: Simplify right side
    30,698.63x = 814,302,155.70
  5. Step 5: Solve for x
    x = 814,302,155.70/30,698.63
  6. Step 6: Final answer
    x = 26,525.68

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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.