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Finding the Fourth Proportional to 645,808.99, 891,339.82 and 427,632.86

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Solution

The fourth proportional to 645,808.99, 891,339.82 and 427,632.86 is: 590,215.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,808.99 : 891,339.82 = 427,632.86 : x
  2. Step 2: Convert to fraction form
    645,808.99/891,339.82 = 427,632.86/x
  3. Step 3: Cross multiply
    645,808.99x = 891,339.82 × 427,632.86
  4. Step 4: Simplify right side
    645,808.99x = 381,166,196,458.49
  5. Step 5: Solve for x
    x = 381,166,196,458.49/645,808.99
  6. Step 6: Final answer
    x = 590,215.07

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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.