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Finding the Fourth Proportional to 708,929.18, 978,317.78 and 403,005.58

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Solution

The fourth proportional to 708,929.18, 978,317.78 and 403,005.58 is: 556,145.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,929.18 : 978,317.78 = 403,005.58 : x
  2. Step 2: Convert to fraction form
    708,929.18/978,317.78 = 403,005.58/x
  3. Step 3: Cross multiply
    708,929.18x = 978,317.78 × 403,005.58
  4. Step 4: Simplify right side
    708,929.18x = 394,267,522,914.93
  5. Step 5: Solve for x
    x = 394,267,522,914.93/708,929.18
  6. Step 6: Final answer
    x = 556,145.14

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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.