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Finding the Fourth Proportional to 220,570.68, 304,390.65 and 128,687.29

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Solution

The fourth proportional to 220,570.68, 304,390.65 and 128,687.29 is: 177,590.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,570.68 : 304,390.65 = 128,687.29 : x
  2. Step 2: Convert to fraction form
    220,570.68/304,390.65 = 128,687.29/x
  3. Step 3: Cross multiply
    220,570.68x = 304,390.65 × 128,687.29
  4. Step 4: Simplify right side
    220,570.68x = 39,171,208,806.85
  5. Step 5: Solve for x
    x = 39,171,208,806.85/220,570.68
  6. Step 6: Final answer
    x = 177,590.28

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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.