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Finding the Fourth Proportional to 210,369.15, 290,320.31 and 128,671.80

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Solution

The fourth proportional to 210,369.15, 290,320.31 and 128,671.80 is: 177,573.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,369.15 : 290,320.31 = 128,671.80 : x
  2. Step 2: Convert to fraction form
    210,369.15/290,320.31 = 128,671.80/x
  3. Step 3: Cross multiply
    210,369.15x = 290,320.31 × 128,671.80
  4. Step 4: Simplify right side
    210,369.15x = 37,356,036,220.90
  5. Step 5: Solve for x
    x = 37,356,036,220.90/210,369.15
  6. Step 6: Final answer
    x = 177,573.74

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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.