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Finding the Fourth Proportional to 426,037.80, 639,056.70 and 215,648.40

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Solution

The fourth proportional to 426,037.80, 639,056.70 and 215,648.40 is: 323,472.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,037.80 : 639,056.70 = 215,648.40 : x
  2. Step 2: Convert to fraction form
    426,037.80/639,056.70 = 215,648.40/x
  3. Step 3: Cross multiply
    426,037.80x = 639,056.70 × 215,648.40
  4. Step 4: Simplify right side
    426,037.80x = 137,811,554,864.28
  5. Step 5: Solve for x
    x = 137,811,554,864.28/426,037.80
  6. Step 6: Final answer
    x = 323,472.60

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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.