Home / 221,130.64-305,139.21-129,271.41

Finding the Fourth Proportional to 221,130.64, 305,139.21 and 129,271.41

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Solution

The fourth proportional to 221,130.64, 305,139.21 and 129,271.41 is: 178,382.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,130.64 : 305,139.21 = 129,271.41 : x
  2. Step 2: Convert to fraction form
    221,130.64/305,139.21 = 129,271.41/x
  3. Step 3: Cross multiply
    221,130.64x = 305,139.21 × 129,271.41
  4. Step 4: Simplify right side
    221,130.64x = 39,445,775,922.99
  5. Step 5: Solve for x
    x = 39,445,775,922.99/221,130.64
  6. Step 6: Final answer
    x = 178,382.23

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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.