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Finding the Fourth Proportional to 645,930.08, 891,370.31 and 404,345.86

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Solution

The fourth proportional to 645,930.08, 891,370.31 and 404,345.86 is: 557,989.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,930.08 : 891,370.31 = 404,345.86 : x
  2. Step 2: Convert to fraction form
    645,930.08/891,370.31 = 404,345.86/x
  3. Step 3: Cross multiply
    645,930.08x = 891,370.31 × 404,345.86
  4. Step 4: Simplify right side
    645,930.08x = 360,421,890,325.26
  5. Step 5: Solve for x
    x = 360,421,890,325.26/645,930.08
  6. Step 6: Final answer
    x = 557,989.02

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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.