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Finding the Fourth Proportional to 651,909.20, 978,439.80 and 385,336.40

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Solution

The fourth proportional to 651,909.20, 978,439.80 and 385,336.40 is: 578,345.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,909.20 : 978,439.80 = 385,336.40 : x
  2. Step 2: Convert to fraction form
    651,909.20/978,439.80 = 385,336.40/x
  3. Step 3: Cross multiply
    651,909.20x = 978,439.80 × 385,336.40
  4. Step 4: Simplify right side
    651,909.20x = 377,028,470,148.72
  5. Step 5: Solve for x
    x = 377,028,470,148.72/651,909.20
  6. Step 6: Final answer
    x = 578,345.07

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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.