Home / 128,901.18-177,883.08-72,312.60

Finding the Fourth Proportional to 128,901.18, 177,883.08 and 72,312.60

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Solution

The fourth proportional to 128,901.18, 177,883.08 and 72,312.60 is: 99,791.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,901.18 : 177,883.08 = 72,312.60 : x
  2. Step 2: Convert to fraction form
    128,901.18/177,883.08 = 72,312.60/x
  3. Step 3: Cross multiply
    128,901.18x = 177,883.08 × 72,312.60
  4. Step 4: Simplify right side
    128,901.18x = 12,863,188,010.81
  5. Step 5: Solve for x
    x = 12,863,188,010.81/128,901.18
  6. Step 6: Final answer
    x = 99,791.08

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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.