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Finding the Fourth Proportional to 645,807.99, 891,338.44 and 427,631.86

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Solution

The fourth proportional to 645,807.99, 891,338.44 and 427,631.86 is: 590,213.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,807.99 : 891,338.44 = 427,631.86 : x
  2. Step 2: Convert to fraction form
    645,807.99/891,338.44 = 427,631.86/x
  3. Step 3: Cross multiply
    645,807.99x = 891,338.44 × 427,631.86
  4. Step 4: Simplify right side
    645,807.99x = 381,164,714,986.70
  5. Step 5: Solve for x
    x = 381,164,714,986.70/645,807.99
  6. Step 6: Final answer
    x = 590,213.69

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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.