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Finding the Fourth Proportional to 612,998.40, 919,497.60 and 426,374.40

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Solution

The fourth proportional to 612,998.40, 919,497.60 and 426,374.40 is: 639,561.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,998.40 : 919,497.60 = 426,374.40 : x
  2. Step 2: Convert to fraction form
    612,998.40/919,497.60 = 426,374.40/x
  3. Step 3: Cross multiply
    612,998.40x = 919,497.60 × 426,374.40
  4. Step 4: Simplify right side
    612,998.40x = 392,050,237,501.44
  5. Step 5: Solve for x
    x = 392,050,237,501.44/612,998.40
  6. Step 6: Final answer
    x = 639,561.60

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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.