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Finding the Fourth Proportional to 443,628.80, 665,443.20 and 128,117.60

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Solution

The fourth proportional to 443,628.80, 665,443.20 and 128,117.60 is: 192,176.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,628.80 : 665,443.20 = 128,117.60 : x
  2. Step 2: Convert to fraction form
    443,628.80/665,443.20 = 128,117.60/x
  3. Step 3: Cross multiply
    443,628.80x = 665,443.20 × 128,117.60
  4. Step 4: Simplify right side
    443,628.80x = 85,254,985,720.32
  5. Step 5: Solve for x
    x = 85,254,985,720.32/443,628.80
  6. Step 6: Final answer
    x = 192,176.40

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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.