Home / 128,130.12-176,809.38-74,406.30

Finding the Fourth Proportional to 128,130.12, 176,809.38 and 74,406.30

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Solution

The fourth proportional to 128,130.12, 176,809.38 and 74,406.30 is: 102,674.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,130.12 : 176,809.38 = 74,406.30 : x
  2. Step 2: Convert to fraction form
    128,130.12/176,809.38 = 74,406.30/x
  3. Step 3: Cross multiply
    128,130.12x = 176,809.38 × 74,406.30
  4. Step 4: Simplify right side
    128,130.12x = 13,155,731,771.09
  5. Step 5: Solve for x
    x = 13,155,731,771.09/128,130.12
  6. Step 6: Final answer
    x = 102,674.78

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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.