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Finding the Fourth Proportional to 30,699.68, 42,361.80 and 19,364.92

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Solution

The fourth proportional to 30,699.68, 42,361.80 and 19,364.92 is: 26,721.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,699.68 : 42,361.80 = 19,364.92 : x
  2. Step 2: Convert to fraction form
    30,699.68/42,361.80 = 19,364.92/x
  3. Step 3: Cross multiply
    30,699.68x = 42,361.80 × 19,364.92
  4. Step 4: Simplify right side
    30,699.68x = 820,332,868.06
  5. Step 5: Solve for x
    x = 820,332,868.06/30,699.68
  6. Step 6: Final answer
    x = 26,721.22

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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.