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Finding the Fourth Proportional to 223,915.79, 309,032.06 and 128,420.44

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Solution

The fourth proportional to 223,915.79, 309,032.06 and 128,420.44 is: 177,236.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,915.79 : 309,032.06 = 128,420.44 : x
  2. Step 2: Convert to fraction form
    223,915.79/309,032.06 = 128,420.44/x
  3. Step 3: Cross multiply
    223,915.79x = 309,032.06 × 128,420.44
  4. Step 4: Simplify right side
    223,915.79x = 39,686,032,426.99
  5. Step 5: Solve for x
    x = 39,686,032,426.99/223,915.79
  6. Step 6: Final answer
    x = 177,236.42

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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.