Home / 128,970.19-177,995.24-72,381.52

Finding the Fourth Proportional to 128,970.19, 177,995.24 and 72,381.52

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Solution

The fourth proportional to 128,970.19, 177,995.24 and 72,381.52 is: 99,895.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,970.19 : 177,995.24 = 72,381.52 : x
  2. Step 2: Convert to fraction form
    128,970.19/177,995.24 = 72,381.52/x
  3. Step 3: Cross multiply
    128,970.19x = 177,995.24 × 72,381.52
  4. Step 4: Simplify right side
    128,970.19x = 12,883,566,023.96
  5. Step 5: Solve for x
    x = 12,883,566,023.96/128,970.19
  6. Step 6: Final answer
    x = 99,895.69

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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.