Home / 128,969.08-177,985.74-72,384.28

Finding the Fourth Proportional to 128,969.08, 177,985.74 and 72,384.28

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Solution

The fourth proportional to 128,969.08, 177,985.74 and 72,384.28 is: 99,895.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,969.08 : 177,985.74 = 72,384.28 : x
  2. Step 2: Convert to fraction form
    128,969.08/177,985.74 = 72,384.28/x
  3. Step 3: Cross multiply
    128,969.08x = 177,985.74 × 72,384.28
  4. Step 4: Simplify right side
    128,969.08x = 12,883,369,640.17
  5. Step 5: Solve for x
    x = 12,883,369,640.17/128,969.08
  6. Step 6: Final answer
    x = 99,895.03

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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.