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Finding the Fourth Proportional to 128,069.34, 176,728.50 and 71,484.36

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Solution

The fourth proportional to 128,069.34, 176,728.50 and 71,484.36 is: 98,644.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,069.34 : 176,728.50 = 71,484.36 : x
  2. Step 2: Convert to fraction form
    128,069.34/176,728.50 = 71,484.36/x
  3. Step 3: Cross multiply
    128,069.34x = 176,728.50 × 71,484.36
  4. Step 4: Simplify right side
    128,069.34x = 12,633,323,716.26
  5. Step 5: Solve for x
    x = 12,633,323,716.26/128,069.34
  6. Step 6: Final answer
    x = 98,644.40

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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.