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Finding the Fourth Proportional to 353,087.68, 529,465.14 and 128,290

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Solution

The fourth proportional to 353,087.68, 529,465.14 and 128,290 is: 192,374.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,087.68 : 529,465.14 = 128,290 : x
  2. Step 2: Convert to fraction form
    353,087.68/529,465.14 = 128,290/x
  3. Step 3: Cross multiply
    353,087.68x = 529,465.14 × 128,290
  4. Step 4: Simplify right side
    353,087.68x = 67,925,082,810.60
  5. Step 5: Solve for x
    x = 67,925,082,810.60/353,087.68
  6. Step 6: Final answer
    x = 192,374.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.