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Finding the Fourth Proportional to 715,977,907.07, 988,042,373.09 and 398,432,713.91

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Solution

The fourth proportional to 715,977,907.07, 988,042,373.09 and 398,432,713.91 is: 549,833,172.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,977,907.07 : 988,042,373.09 = 398,432,713.91 : x
  2. Step 2: Convert to fraction form
    715,977,907.07/988,042,373.09 = 398,432,713.91/x
  3. Step 3: Cross multiply
    715,977,907.07x = 988,042,373.09 × 398,432,713.91
  4. Step 4: Simplify right side
    715,977,907.07x = 393,668,404,168,325,504
  5. Step 5: Solve for x
    x = 393,668,404,168,325,504/715,977,907.07
  6. Step 6: Final answer
    x = 549,833,172.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.