Home / 21,981.18-30,328.65-13,030.80

Finding the Fourth Proportional to 21,981.18, 30,328.65 and 13,030.80

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Solution

The fourth proportional to 21,981.18, 30,328.65 and 13,030.80 is: 17,979.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.18 : 30,328.65 = 13,030.80 : x
  2. Step 2: Convert to fraction form
    21,981.18/30,328.65 = 13,030.80/x
  3. Step 3: Cross multiply
    21,981.18x = 30,328.65 × 13,030.80
  4. Step 4: Simplify right side
    21,981.18x = 395,206,572.42
  5. Step 5: Solve for x
    x = 395,206,572.42/21,981.18
  6. Step 6: Final answer
    x = 17,979.32

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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.