Home / 128,985.06-177,989.63-72,385.50

Finding the Fourth Proportional to 128,985.06, 177,989.63 and 72,385.50

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Solution

The fourth proportional to 128,985.06, 177,989.63 and 72,385.50 is: 99,886.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.06 : 177,989.63 = 72,385.50 : x
  2. Step 2: Convert to fraction form
    128,985.06/177,989.63 = 72,385.50/x
  3. Step 3: Cross multiply
    128,985.06x = 177,989.63 × 72,385.50
  4. Step 4: Simplify right side
    128,985.06x = 12,883,868,000.44
  5. Step 5: Solve for x
    x = 12,883,868,000.44/128,985.06
  6. Step 6: Final answer
    x = 99,886.51

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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.