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Finding the Fourth Proportional to 128,607.04, 177,472.74 and 72,015.52

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Solution

The fourth proportional to 128,607.04, 177,472.74 and 72,015.52 is: 99,378.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,607.04 : 177,472.74 = 72,015.52 : x
  2. Step 2: Convert to fraction form
    128,607.04/177,472.74 = 72,015.52/x
  3. Step 3: Cross multiply
    128,607.04x = 177,472.74 × 72,015.52
  4. Step 4: Simplify right side
    128,607.04x = 12,780,791,656.92
  5. Step 5: Solve for x
    x = 12,780,791,656.92/128,607.04
  6. Step 6: Final answer
    x = 99,378.63

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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.