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Finding the Fourth Proportional to 170,020.80, 255,128.40 and 64,915.20

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Solution

The fourth proportional to 170,020.80, 255,128.40 and 64,915.20 is: 97,409.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,020.80 : 255,128.40 = 64,915.20 : x
  2. Step 2: Convert to fraction form
    170,020.80/255,128.40 = 64,915.20/x
  3. Step 3: Cross multiply
    170,020.80x = 255,128.40 × 64,915.20
  4. Step 4: Simplify right side
    170,020.80x = 16,561,711,111.68
  5. Step 5: Solve for x
    x = 16,561,711,111.68/170,020.80
  6. Step 6: Final answer
    x = 97,409.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.