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Finding the Fourth Proportional to 645,806.99, 891,337.06 and 427,630.86

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Solution

The fourth proportional to 645,806.99, 891,337.06 and 427,630.86 is: 590,212.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,806.99 : 891,337.06 = 427,630.86 : x
  2. Step 2: Convert to fraction form
    645,806.99/891,337.06 = 427,630.86/x
  3. Step 3: Cross multiply
    645,806.99x = 891,337.06 × 427,630.86
  4. Step 4: Simplify right side
    645,806.99x = 381,163,234,052.21
  5. Step 5: Solve for x
    x = 381,163,234,052.21/645,806.99
  6. Step 6: Final answer
    x = 590,212.31

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1.5x scale

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.