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Finding the Fourth Proportional to 408,085.20, 612,127.80 and 289,112.40

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Solution

The fourth proportional to 408,085.20, 612,127.80 and 289,112.40 is: 433,668.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,085.20 : 612,127.80 = 289,112.40 : x
  2. Step 2: Convert to fraction form
    408,085.20/612,127.80 = 289,112.40/x
  3. Step 3: Cross multiply
    408,085.20x = 612,127.80 × 289,112.40
  4. Step 4: Simplify right side
    408,085.20x = 176,973,737,364.72
  5. Step 5: Solve for x
    x = 176,973,737,364.72/408,085.20
  6. Step 6: Final answer
    x = 433,668.60

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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.