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Finding the Fourth Proportional to 647,421.20, 971,131.80 and 247,856.30

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Solution

The fourth proportional to 647,421.20, 971,131.80 and 247,856.30 is: 371,784.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,421.20 : 971,131.80 = 247,856.30 : x
  2. Step 2: Convert to fraction form
    647,421.20/971,131.80 = 247,856.30/x
  3. Step 3: Cross multiply
    647,421.20x = 971,131.80 × 247,856.30
  4. Step 4: Simplify right side
    647,421.20x = 240,701,134,760.34
  5. Step 5: Solve for x
    x = 240,701,134,760.34/647,421.20
  6. Step 6: Final answer
    x = 371,784.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.