Home / 30,774.02-42,456.68-20,686.48

Finding the Fourth Proportional to 30,774.02, 42,456.68 and 20,686.48

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Solution

The fourth proportional to 30,774.02, 42,456.68 and 20,686.48 is: 28,539.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,774.02 : 42,456.68 = 20,686.48 : x
  2. Step 2: Convert to fraction form
    30,774.02/42,456.68 = 20,686.48/x
  3. Step 3: Cross multiply
    30,774.02x = 42,456.68 × 20,686.48
  4. Step 4: Simplify right side
    30,774.02x = 878,279,261.69
  5. Step 5: Solve for x
    x = 878,279,261.69/30,774.02
  6. Step 6: Final answer
    x = 28,539.63

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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.