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Finding the Fourth Proportional to 128,979.84, 178,009.04 and 72,391.22

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Solution

The fourth proportional to 128,979.84, 178,009.04 and 72,391.22 is: 99,909.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.84 : 178,009.04 = 72,391.22 : x
  2. Step 2: Convert to fraction form
    128,979.84/178,009.04 = 72,391.22/x
  3. Step 3: Cross multiply
    128,979.84x = 178,009.04 × 72,391.22
  4. Step 4: Simplify right side
    128,979.84x = 12,886,291,535.10
  5. Step 5: Solve for x
    x = 12,886,291,535.10/128,979.84
  6. Step 6: Final answer
    x = 99,909.34

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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.