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Finding the Fourth Proportional to 715,925.54, 987,980.95 and 393,656.39

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Solution

The fourth proportional to 715,925.54, 987,980.95 and 393,656.39 is: 543,247.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,925.54 : 987,980.95 = 393,656.39 : x
  2. Step 2: Convert to fraction form
    715,925.54/987,980.95 = 393,656.39/x
  3. Step 3: Cross multiply
    715,925.54x = 987,980.95 × 393,656.39
  4. Step 4: Simplify right side
    715,925.54x = 388,925,014,165.77
  5. Step 5: Solve for x
    x = 388,925,014,165.77/715,925.54
  6. Step 6: Final answer
    x = 543,247.86

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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.