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Finding the Fourth Proportional to 715,749.12, 987,733.44 and 393,480

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Solution

The fourth proportional to 715,749.12, 987,733.44 and 393,480 is: 543,002.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,749.12 : 987,733.44 = 393,480 : x
  2. Step 2: Convert to fraction form
    715,749.12/987,733.44 = 393,480/x
  3. Step 3: Cross multiply
    715,749.12x = 987,733.44 × 393,480
  4. Step 4: Simplify right side
    715,749.12x = 388,653,353,971.20
  5. Step 5: Solve for x
    x = 388,653,353,971.20/715,749.12
  6. Step 6: Final answer
    x = 543,002.21

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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.