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Finding the Fourth Proportional to 715,950.81, 988,011.91 and 393,681.78

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Solution

The fourth proportional to 715,950.81, 988,011.91 and 393,681.78 is: 543,280.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,950.81 : 988,011.91 = 393,681.78 : x
  2. Step 2: Convert to fraction form
    715,950.81/988,011.91 = 393,681.78/x
  3. Step 3: Cross multiply
    715,950.81x = 988,011.91 × 393,681.78
  4. Step 4: Simplify right side
    715,950.81x = 388,962,287,390.00
  5. Step 5: Solve for x
    x = 388,962,287,390.00/715,950.81
  6. Step 6: Final answer
    x = 543,280.74

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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.