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Finding the Fourth Proportional to 213,490.16, 294,574.56 and 128,611.88

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Solution

The fourth proportional to 213,490.16, 294,574.56 and 128,611.88 is: 177,459.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,490.16 : 294,574.56 = 128,611.88 : x
  2. Step 2: Convert to fraction form
    213,490.16/294,574.56 = 128,611.88/x
  3. Step 3: Cross multiply
    213,490.16x = 294,574.56 × 128,611.88
  4. Step 4: Simplify right side
    213,490.16x = 37,885,787,961.77
  5. Step 5: Solve for x
    x = 37,885,787,961.77/213,490.16
  6. Step 6: Final answer
    x = 177,459.18

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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.