Home / 30,616.17-42,252.21-20,389.68

Finding the Fourth Proportional to 30,616.17, 42,252.21 and 20,389.68

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Solution

The fourth proportional to 30,616.17, 42,252.21 and 20,389.68 is: 28,139.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,616.17 : 42,252.21 = 20,389.68 : x
  2. Step 2: Convert to fraction form
    30,616.17/42,252.21 = 20,389.68/x
  3. Step 3: Cross multiply
    30,616.17x = 42,252.21 × 20,389.68
  4. Step 4: Simplify right side
    30,616.17x = 861,509,041.19
  5. Step 5: Solve for x
    x = 861,509,041.19/30,616.17
  6. Step 6: Final answer
    x = 28,139.02

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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.