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Finding the Fourth Proportional to 128,904.32, 177,885.28 and 71,540.31

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Solution

The fourth proportional to 128,904.32, 177,885.28 and 71,540.31 is: 98,724.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,904.32 : 177,885.28 = 71,540.31 : x
  2. Step 2: Convert to fraction form
    128,904.32/177,885.28 = 71,540.31/x
  3. Step 3: Cross multiply
    128,904.32x = 177,885.28 × 71,540.31
  4. Step 4: Simplify right side
    128,904.32x = 12,725,968,075.64
  5. Step 5: Solve for x
    x = 12,725,968,075.64/128,904.32
  6. Step 6: Final answer
    x = 98,724.14

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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.