Home / 30,435.17-42,016.26-20,987.33

Finding the Fourth Proportional to 30,435.17, 42,016.26 and 20,987.33

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Solution

The fourth proportional to 30,435.17, 42,016.26 and 20,987.33 is: 28,973.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,435.17 : 42,016.26 = 20,987.33 : x
  2. Step 2: Convert to fraction form
    30,435.17/42,016.26 = 20,987.33/x
  3. Step 3: Cross multiply
    30,435.17x = 42,016.26 × 20,987.33
  4. Step 4: Simplify right side
    30,435.17x = 881,808,903.90
  5. Step 5: Solve for x
    x = 881,808,903.90/30,435.17
  6. Step 6: Final answer
    x = 28,973.36

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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.