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Finding the Fourth Proportional to 708,807.58, 978,178.08 and 386,535.31

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Solution

The fourth proportional to 708,807.58, 978,178.08 and 386,535.31 is: 533,431.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,807.58 : 978,178.08 = 386,535.31 : x
  2. Step 2: Convert to fraction form
    708,807.58/978,178.08 = 386,535.31/x
  3. Step 3: Cross multiply
    708,807.58x = 978,178.08 × 386,535.31
  4. Step 4: Simplify right side
    708,807.58x = 378,100,367,388.01
  5. Step 5: Solve for x
    x = 378,100,367,388.01/708,807.58
  6. Step 6: Final answer
    x = 533,431.61

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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.