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Finding the Fourth Proportional to 612,235,123.80, 918,352,685.70 and 248,990,170.20

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Solution

The fourth proportional to 612,235,123.80, 918,352,685.70 and 248,990,170.20 is: 373,485,255.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,235,123.80 : 918,352,685.70 = 248,990,170.20 : x
  2. Step 2: Convert to fraction form
    612,235,123.80/918,352,685.70 = 248,990,170.20/x
  3. Step 3: Cross multiply
    612,235,123.80x = 918,352,685.70 × 248,990,170.20
  4. Step 4: Simplify right side
    612,235,123.80x = 228,660,791,516,070,112
  5. Step 5: Solve for x
    x = 228,660,791,516,070,112/612,235,123.80
  6. Step 6: Final answer
    x = 373,485,255.30

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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.