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Finding the Fourth Proportional to 128,231.04, 176,955.52 and 71,642.80

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Solution

The fourth proportional to 128,231.04, 176,955.52 and 71,642.80 is: 98,865.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,231.04 : 176,955.52 = 71,642.80 : x
  2. Step 2: Convert to fraction form
    128,231.04/176,955.52 = 71,642.80/x
  3. Step 3: Cross multiply
    128,231.04x = 176,955.52 × 71,642.80
  4. Step 4: Simplify right side
    128,231.04x = 12,677,588,928.26
  5. Step 5: Solve for x
    x = 12,677,588,928.26/128,231.04
  6. Step 6: Final answer
    x = 98,865.21

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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.