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Finding the Fourth Proportional to 128,957.36, 177,964.66 and 72,372.20

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Solution

The fourth proportional to 128,957.36, 177,964.66 and 72,372.20 is: 99,875.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,957.36 : 177,964.66 = 72,372.20 : x
  2. Step 2: Convert to fraction form
    128,957.36/177,964.66 = 72,372.20/x
  3. Step 3: Cross multiply
    128,957.36x = 177,964.66 × 72,372.20
  4. Step 4: Simplify right side
    128,957.36x = 12,879,693,966.45
  5. Step 5: Solve for x
    x = 12,879,693,966.45/128,957.36
  6. Step 6: Final answer
    x = 99,875.60

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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.