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Finding the Fourth Proportional to 128,653.50, 177,525.20 and 72,064.86

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Solution

The fourth proportional to 128,653.50, 177,525.20 and 72,064.86 is: 99,440.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,653.50 : 177,525.20 = 72,064.86 : x
  2. Step 2: Convert to fraction form
    128,653.50/177,525.20 = 72,064.86/x
  3. Step 3: Cross multiply
    128,653.50x = 177,525.20 × 72,064.86
  4. Step 4: Simplify right side
    128,653.50x = 12,793,328,684.47
  5. Step 5: Solve for x
    x = 12,793,328,684.47/128,653.50
  6. Step 6: Final answer
    x = 99,440.19

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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.