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Finding the Fourth Proportional to 328,060,620.80, 492,053,606.40 and 85,748,019.20

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Solution

The fourth proportional to 328,060,620.80, 492,053,606.40 and 85,748,019.20 is: 128,612,272.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,060,620.80 : 492,053,606.40 = 85,748,019.20 : x
  2. Step 2: Convert to fraction form
    328,060,620.80/492,053,606.40 = 85,748,019.20/x
  3. Step 3: Cross multiply
    328,060,620.80x = 492,053,606.40 × 85,748,019.20
  4. Step 4: Simplify right side
    328,060,620.80x = 42,192,622,089,016,440
  5. Step 5: Solve for x
    x = 42,192,622,089,016,440/328,060,620.80
  6. Step 6: Final answer
    x = 128,612,272.90

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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.