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Finding the Fourth Proportional to 128,643.30, 177,525.81 and 72,056.70

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Solution

The fourth proportional to 128,643.30, 177,525.81 and 72,056.70 is: 99,437.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,643.30 : 177,525.81 = 72,056.70 : x
  2. Step 2: Convert to fraction form
    128,643.30/177,525.81 = 72,056.70/x
  3. Step 3: Cross multiply
    128,643.30x = 177,525.81 × 72,056.70
  4. Step 4: Simplify right side
    128,643.30x = 12,791,924,033.43
  5. Step 5: Solve for x
    x = 12,791,924,033.43/128,643.30
  6. Step 6: Final answer
    x = 99,437.16

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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.