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Finding the Fourth Proportional to 144,391.80, 216,458.10 and 128,645.40

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Solution

The fourth proportional to 144,391.80, 216,458.10 and 128,645.40 is: 192,852.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,391.80 : 216,458.10 = 128,645.40 : x
  2. Step 2: Convert to fraction form
    144,391.80/216,458.10 = 128,645.40/x
  3. Step 3: Cross multiply
    144,391.80x = 216,458.10 × 128,645.40
  4. Step 4: Simplify right side
    144,391.80x = 27,846,338,857.74
  5. Step 5: Solve for x
    x = 27,846,338,857.74/144,391.80
  6. Step 6: Final answer
    x = 192,852.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.