Home / 30,721.80-42,403.02-18,795.08

Finding the Fourth Proportional to 30,721.80, 42,403.02 and 18,795.08

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Solution

The fourth proportional to 30,721.80, 42,403.02 and 18,795.08 is: 25,941.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,721.80 : 42,403.02 = 18,795.08 : x
  2. Step 2: Convert to fraction form
    30,721.80/42,403.02 = 18,795.08/x
  3. Step 3: Cross multiply
    30,721.80x = 42,403.02 × 18,795.08
  4. Step 4: Simplify right side
    30,721.80x = 796,968,153.14
  5. Step 5: Solve for x
    x = 796,968,153.14/30,721.80
  6. Step 6: Final answer
    x = 25,941.45

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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.