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Finding the Fourth Proportional to 128,485.62, 177,312.51 and 71,896.86

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Solution

The fourth proportional to 128,485.62, 177,312.51 and 71,896.86 is: 99,218.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,485.62 : 177,312.51 = 71,896.86 : x
  2. Step 2: Convert to fraction form
    128,485.62/177,312.51 = 71,896.86/x
  3. Step 3: Cross multiply
    128,485.62x = 177,312.51 × 71,896.86
  4. Step 4: Simplify right side
    128,485.62x = 12,748,212,707.72
  5. Step 5: Solve for x
    x = 12,748,212,707.72/128,485.62
  6. Step 6: Final answer
    x = 99,218.98

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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.