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Finding the Fourth Proportional to 30,938.95, 42,695.79 and 16,791.79

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Solution

The fourth proportional to 30,938.95, 42,695.79 and 16,791.79 is: 23,172.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,938.95 : 42,695.79 = 16,791.79 : x
  2. Step 2: Convert to fraction form
    30,938.95/42,695.79 = 16,791.79/x
  3. Step 3: Cross multiply
    30,938.95x = 42,695.79 × 16,791.79
  4. Step 4: Simplify right side
    30,938.95x = 716,938,792.93
  5. Step 5: Solve for x
    x = 716,938,792.93/30,938.95
  6. Step 6: Final answer
    x = 23,172.69

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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.