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Finding the Fourth Proportional to 147,641.70, 220,879.35 and 128,136.90

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Solution

The fourth proportional to 147,641.70, 220,879.35 and 128,136.90 is: 191,699.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,641.70 : 220,879.35 = 128,136.90 : x
  2. Step 2: Convert to fraction form
    147,641.70/220,879.35 = 128,136.90/x
  3. Step 3: Cross multiply
    147,641.70x = 220,879.35 × 128,136.90
  4. Step 4: Simplify right side
    147,641.70x = 28,302,795,183.02
  5. Step 5: Solve for x
    x = 28,302,795,183.02/147,641.70
  6. Step 6: Final answer
    x = 191,699.20

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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.