Home / 128,993.06-178,000.65-72,393.50

Finding the Fourth Proportional to 128,993.06, 178,000.65 and 72,393.50

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Solution

The fourth proportional to 128,993.06, 178,000.65 and 72,393.50 is: 99,897.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,993.06 : 178,000.65 = 72,393.50 : x
  2. Step 2: Convert to fraction form
    128,993.06/178,000.65 = 72,393.50/x
  3. Step 3: Cross multiply
    128,993.06x = 178,000.65 × 72,393.50
  4. Step 4: Simplify right side
    128,993.06x = 12,886,090,055.78
  5. Step 5: Solve for x
    x = 12,886,090,055.78/128,993.06
  6. Step 6: Final answer
    x = 99,897.55

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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.