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Finding the Fourth Proportional to 978,218.80, 1,467,328.20 and 642,295.60

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Solution

The fourth proportional to 978,218.80, 1,467,328.20 and 642,295.60 is: 963,443.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,218.80 : 1,467,328.20 = 642,295.60 : x
  2. Step 2: Convert to fraction form
    978,218.80/1,467,328.20 = 642,295.60/x
  3. Step 3: Cross multiply
    978,218.80x = 1,467,328.20 × 642,295.60
  4. Step 4: Simplify right side
    978,218.80x = 942,458,446,615.92
  5. Step 5: Solve for x
    x = 942,458,446,615.92/978,218.80
  6. Step 6: Final answer
    x = 963,443.40

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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.