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Finding the Fourth Proportional to 128,907.20, 193,360.80 and 93,915.20

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Solution

The fourth proportional to 128,907.20, 193,360.80 and 93,915.20 is: 140,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,907.20 : 193,360.80 = 93,915.20 : x
  2. Step 2: Convert to fraction form
    128,907.20/193,360.80 = 93,915.20/x
  3. Step 3: Cross multiply
    128,907.20x = 193,360.80 × 93,915.20
  4. Step 4: Simplify right side
    128,907.20x = 18,159,518,204.16
  5. Step 5: Solve for x
    x = 18,159,518,204.16/128,907.20
  6. Step 6: Final answer
    x = 140,872.80

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1.5x scale

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.