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Finding the Fourth Proportional to 128,590.96, 177,462.84 and 72,001.84

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Solution

The fourth proportional to 128,590.96, 177,462.84 and 72,001.84 is: 99,366.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,590.96 : 177,462.84 = 72,001.84 : x
  2. Step 2: Convert to fraction form
    128,590.96/177,462.84 = 72,001.84/x
  3. Step 3: Cross multiply
    128,590.96x = 177,462.84 × 72,001.84
  4. Step 4: Simplify right side
    128,590.96x = 12,777,651,011.63
  5. Step 5: Solve for x
    x = 12,777,651,011.63/128,590.96
  6. Step 6: Final answer
    x = 99,366.64

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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.