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Finding the Fourth Proportional to 715,775.12, 987,769.32 and 393,506

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Solution

The fourth proportional to 715,775.12, 987,769.32 and 393,506 is: 543,038.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,775.12 : 987,769.32 = 393,506 : x
  2. Step 2: Convert to fraction form
    715,775.12/987,769.32 = 393,506/x
  3. Step 3: Cross multiply
    715,775.12x = 987,769.32 × 393,506
  4. Step 4: Simplify right side
    715,775.12x = 388,693,154,035.92
  5. Step 5: Solve for x
    x = 388,693,154,035.92/715,775.12
  6. Step 6: Final answer
    x = 543,038.09

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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.