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Finding the Fourth Proportional to 715,495.12, 987,362.69 and 393,204.83

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Solution

The fourth proportional to 715,495.12, 987,362.69 and 393,204.83 is: 542,611.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,495.12 : 987,362.69 = 393,204.83 : x
  2. Step 2: Convert to fraction form
    715,495.12/987,362.69 = 393,204.83/x
  3. Step 3: Cross multiply
    715,495.12x = 987,362.69 × 393,204.83
  4. Step 4: Simplify right side
    715,495.12x = 388,235,778,669.79
  5. Step 5: Solve for x
    x = 388,235,778,669.79/715,495.12
  6. Step 6: Final answer
    x = 542,611.36

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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.