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Finding the Fourth Proportional to 715,931.82, 987,989.62 and 393,662.66

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Solution

The fourth proportional to 715,931.82, 987,989.62 and 393,662.66 is: 543,256.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,931.82 : 987,989.62 = 393,662.66 : x
  2. Step 2: Convert to fraction form
    715,931.82/987,989.62 = 393,662.66/x
  3. Step 3: Cross multiply
    715,931.82x = 987,989.62 × 393,662.66
  4. Step 4: Simplify right side
    715,931.82x = 388,934,621,861.59
  5. Step 5: Solve for x
    x = 388,934,621,861.59/715,931.82
  6. Step 6: Final answer
    x = 543,256.51

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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.