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Finding the Fourth Proportional to 612,081.20, 918,121.80 and 423,124.40

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Solution

The fourth proportional to 612,081.20, 918,121.80 and 423,124.40 is: 634,686.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,081.20 : 918,121.80 = 423,124.40 : x
  2. Step 2: Convert to fraction form
    612,081.20/918,121.80 = 423,124.40/x
  3. Step 3: Cross multiply
    612,081.20x = 918,121.80 × 423,124.40
  4. Step 4: Simplify right side
    612,081.20x = 388,479,735,751.92
  5. Step 5: Solve for x
    x = 388,479,735,751.92/612,081.20
  6. Step 6: Final answer
    x = 634,686.60

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Similar ratio
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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.