Home / 129,628.80-178,970.31-105,812.10

Finding the Fourth Proportional to 129,628.80, 178,970.31 and 105,812.10

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Solution

The fourth proportional to 129,628.80, 178,970.31 and 105,812.10 is: 146,088.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,628.80 : 178,970.31 = 105,812.10 : x
  2. Step 2: Convert to fraction form
    129,628.80/178,970.31 = 105,812.10/x
  3. Step 3: Cross multiply
    129,628.80x = 178,970.31 × 105,812.10
  4. Step 4: Simplify right side
    129,628.80x = 18,937,224,338.75
  5. Step 5: Solve for x
    x = 18,937,224,338.75/129,628.80
  6. Step 6: Final answer
    x = 146,088.09

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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.