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Finding the Fourth Proportional to 708,988.45, 978,415.72 and 386,698.55

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Solution

The fourth proportional to 708,988.45, 978,415.72 and 386,698.55 is: 533,650.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,988.45 : 978,415.72 = 386,698.55 : x
  2. Step 2: Convert to fraction form
    708,988.45/978,415.72 = 386,698.55/x
  3. Step 3: Cross multiply
    708,988.45x = 978,415.72 × 386,698.55
  4. Step 4: Simplify right side
    708,988.45x = 378,351,940,315.11
  5. Step 5: Solve for x
    x = 378,351,940,315.11/708,988.45
  6. Step 6: Final answer
    x = 533,650.36

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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.