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Finding the Fourth Proportional to 30,618, 42,256.08 and 19,440

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Solution

The fourth proportional to 30,618, 42,256.08 and 19,440 is: 26,829.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,618 : 42,256.08 = 19,440 : x
  2. Step 2: Convert to fraction form
    30,618/42,256.08 = 19,440/x
  3. Step 3: Cross multiply
    30,618x = 42,256.08 × 19,440
  4. Step 4: Simplify right side
    30,618x = 821,458,195.20
  5. Step 5: Solve for x
    x = 821,458,195.20/30,618
  6. Step 6: Final answer
    x = 26,829.26

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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.