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Finding the Fourth Proportional to 612,115.40, 918,173.10 and 423,158.60

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Solution

The fourth proportional to 612,115.40, 918,173.10 and 423,158.60 is: 634,737.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,115.40 : 918,173.10 = 423,158.60 : x
  2. Step 2: Convert to fraction form
    612,115.40/918,173.10 = 423,158.60/x
  3. Step 3: Cross multiply
    612,115.40x = 918,173.10 × 423,158.60
  4. Step 4: Simplify right side
    612,115.40x = 388,532,843,553.66
  5. Step 5: Solve for x
    x = 388,532,843,553.66/612,115.40
  6. Step 6: Final answer
    x = 634,737.90

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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.