Home / 21,980.04-30,330.63-12,420.77

Finding the Fourth Proportional to 21,980.04, 30,330.63 and 12,420.77

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Solution

The fourth proportional to 21,980.04, 30,330.63 and 12,420.77 is: 17,139.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,980.04 : 30,330.63 = 12,420.77 : x
  2. Step 2: Convert to fraction form
    21,980.04/30,330.63 = 12,420.77/x
  3. Step 3: Cross multiply
    21,980.04x = 30,330.63 × 12,420.77
  4. Step 4: Simplify right side
    21,980.04x = 376,729,627.53
  5. Step 5: Solve for x
    x = 376,729,627.53/21,980.04
  6. Step 6: Final answer
    x = 17,139.62

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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.