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Finding the Fourth Proportional to 128,459.54, 177,274.32 and 71,870.96

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Solution

The fourth proportional to 128,459.54, 177,274.32 and 71,870.96 is: 99,182.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,459.54 : 177,274.32 = 71,870.96 : x
  2. Step 2: Convert to fraction form
    128,459.54/177,274.32 = 71,870.96/x
  3. Step 3: Cross multiply
    128,459.54x = 177,274.32 × 71,870.96
  4. Step 4: Simplify right side
    128,459.54x = 12,740,875,561.75
  5. Step 5: Solve for x
    x = 12,740,875,561.75/128,459.54
  6. Step 6: Final answer
    x = 99,182.01

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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.