Home / 28,538.96-42,643.28-20,603.80

Finding the Fourth Proportional to 28,538.96, 42,643.28 and 20,603.80

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Solution

The fourth proportional to 28,538.96, 42,643.28 and 20,603.80 is: 30,786.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,538.96 : 42,643.28 = 20,603.80 : x
  2. Step 2: Convert to fraction form
    28,538.96/42,643.28 = 20,603.80/x
  3. Step 3: Cross multiply
    28,538.96x = 42,643.28 × 20,603.80
  4. Step 4: Simplify right side
    28,538.96x = 878,613,612.46
  5. Step 5: Solve for x
    x = 878,613,612.46/28,538.96
  6. Step 6: Final answer
    x = 30,786.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.