Home / 30,720.66-42,412.59-28,949.22

Finding the Fourth Proportional to 30,720.66, 42,412.59 and 28,949.22

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Solution

The fourth proportional to 30,720.66, 42,412.59 and 28,949.22 is: 39,966.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.66 : 42,412.59 = 28,949.22 : x
  2. Step 2: Convert to fraction form
    30,720.66/42,412.59 = 28,949.22/x
  3. Step 3: Cross multiply
    30,720.66x = 42,412.59 × 28,949.22
  4. Step 4: Simplify right side
    30,720.66x = 1,227,811,398.68
  5. Step 5: Solve for x
    x = 1,227,811,398.68/30,720.66
  6. Step 6: Final answer
    x = 39,966.96

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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.