Home / 129,403.64-178,535.49-78,400.07

Finding the Fourth Proportional to 129,403.64, 178,535.49 and 78,400.07

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Solution

The fourth proportional to 129,403.64, 178,535.49 and 78,400.07 is: 108,166.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,403.64 : 178,535.49 = 78,400.07 : x
  2. Step 2: Convert to fraction form
    129,403.64/178,535.49 = 78,400.07/x
  3. Step 3: Cross multiply
    129,403.64x = 178,535.49 × 78,400.07
  4. Step 4: Simplify right side
    129,403.64x = 13,997,194,837.32
  5. Step 5: Solve for x
    x = 13,997,194,837.32/129,403.64
  6. Step 6: Final answer
    x = 108,166.93

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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.