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Finding the Fourth Proportional to 91,993,799.20, 137,990,698.80 and 78,315,426.40

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Solution

The fourth proportional to 91,993,799.20, 137,990,698.80 and 78,315,426.40 is: 117,473,139.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,993,799.20 : 137,990,698.80 = 78,315,426.40 : x
  2. Step 2: Convert to fraction form
    91,993,799.20/137,990,698.80 = 78,315,426.40/x
  3. Step 3: Cross multiply
    91,993,799.20x = 137,990,698.80 × 78,315,426.40
  4. Step 4: Simplify right side
    91,993,799.20x = 10,806,800,415,755,970
  5. Step 5: Solve for x
    x = 10,806,800,415,755,970/91,993,799.20
  6. Step 6: Final answer
    x = 117,473,139.60

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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.