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Finding the Fourth Proportional to 128,697.51, 177,602.45 and 72,109.29

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Solution

The fourth proportional to 128,697.51, 177,602.45 and 72,109.29 is: 99,510.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,697.51 : 177,602.45 = 72,109.29 : x
  2. Step 2: Convert to fraction form
    128,697.51/177,602.45 = 72,109.29/x
  3. Step 3: Cross multiply
    128,697.51x = 177,602.45 × 72,109.29
  4. Step 4: Simplify right side
    128,697.51x = 12,806,786,211.21
  5. Step 5: Solve for x
    x = 12,806,786,211.21/128,697.51
  6. Step 6: Final answer
    x = 99,510.75

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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.