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Finding the Fourth Proportional to 318,963.20, 478,329.60 and 161,139.20

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Solution

The fourth proportional to 318,963.20, 478,329.60 and 161,139.20 is: 241,650.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,963.20 : 478,329.60 = 161,139.20 : x
  2. Step 2: Convert to fraction form
    318,963.20/478,329.60 = 161,139.20/x
  3. Step 3: Cross multiply
    318,963.20x = 478,329.60 × 161,139.20
  4. Step 4: Simplify right side
    318,963.20x = 77,077,649,080.32
  5. Step 5: Solve for x
    x = 77,077,649,080.32/318,963.20
  6. Step 6: Final answer
    x = 241,650.60

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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.