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Finding the Fourth Proportional to 715,566.40, 987,499.74 and 393,284.68

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Solution

The fourth proportional to 715,566.40, 987,499.74 and 393,284.68 is: 542,742.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,566.40 : 987,499.74 = 393,284.68 : x
  2. Step 2: Convert to fraction form
    715,566.40/987,499.74 = 393,284.68/x
  3. Step 3: Cross multiply
    715,566.40x = 987,499.74 × 393,284.68
  4. Step 4: Simplify right side
    715,566.40x = 388,368,519,245.98
  5. Step 5: Solve for x
    x = 388,368,519,245.98/715,566.40
  6. Step 6: Final answer
    x = 542,742.81

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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.