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Finding the Fourth Proportional to 128,777.48, 177,713.16 and 72,188.72

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Solution

The fourth proportional to 128,777.48, 177,713.16 and 72,188.72 is: 99,620.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,777.48 : 177,713.16 = 72,188.72 : x
  2. Step 2: Convert to fraction form
    128,777.48/177,713.16 = 72,188.72/x
  3. Step 3: Cross multiply
    128,777.48x = 177,713.16 × 72,188.72
  4. Step 4: Simplify right side
    128,777.48x = 12,828,885,547.56
  5. Step 5: Solve for x
    x = 12,828,885,547.56/128,777.48
  6. Step 6: Final answer
    x = 99,620.57

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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.