Home / 123,780.32-185,640.60-57,156.40

Finding the Fourth Proportional to 123,780.32, 185,640.60 and 57,156.40

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Solution

The fourth proportional to 123,780.32, 185,640.60 and 57,156.40 is: 85,720.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,780.32 : 185,640.60 = 57,156.40 : x
  2. Step 2: Convert to fraction form
    123,780.32/185,640.60 = 57,156.40/x
  3. Step 3: Cross multiply
    123,780.32x = 185,640.60 × 57,156.40
  4. Step 4: Simplify right side
    123,780.32x = 10,610,548,389.84
  5. Step 5: Solve for x
    x = 10,610,548,389.84/123,780.32
  6. Step 6: Final answer
    x = 85,720.80

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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.