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Finding the Fourth Proportional to 30,506.58, 42,111.90 and 18,574.20

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Solution

The fourth proportional to 30,506.58, 42,111.90 and 18,574.20 is: 25,640.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,506.58 : 42,111.90 = 18,574.20 : x
  2. Step 2: Convert to fraction form
    30,506.58/42,111.90 = 18,574.20/x
  3. Step 3: Cross multiply
    30,506.58x = 42,111.90 × 18,574.20
  4. Step 4: Simplify right side
    30,506.58x = 782,194,852.98
  5. Step 5: Solve for x
    x = 782,194,852.98/30,506.58
  6. Step 6: Final answer
    x = 25,640.20

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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.