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Finding the Fourth Proportional to 219,454.20, 302,888.78 and 128,830.20

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Solution

The fourth proportional to 219,454.20, 302,888.78 and 128,830.20 is: 177,810.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,454.20 : 302,888.78 = 128,830.20 : x
  2. Step 2: Convert to fraction form
    219,454.20/302,888.78 = 128,830.20/x
  3. Step 3: Cross multiply
    219,454.20x = 302,888.78 × 128,830.20
  4. Step 4: Simplify right side
    219,454.20x = 39,021,222,105.16
  5. Step 5: Solve for x
    x = 39,021,222,105.16/219,454.20
  6. Step 6: Final answer
    x = 177,810.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.