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Finding the Fourth Proportional to 128,374.47, 177,143.15 and 71,004.67

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Solution

The fourth proportional to 128,374.47, 177,143.15 and 71,004.67 is: 97,978.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,374.47 : 177,143.15 = 71,004.67 : x
  2. Step 2: Convert to fraction form
    128,374.47/177,143.15 = 71,004.67/x
  3. Step 3: Cross multiply
    128,374.47x = 177,143.15 × 71,004.67
  4. Step 4: Simplify right side
    128,374.47x = 12,577,990,643.16
  5. Step 5: Solve for x
    x = 12,577,990,643.16/128,374.47
  6. Step 6: Final answer
    x = 97,978.91

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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.