Home / 129,403.80-178,128.18-111,557.88

Finding the Fourth Proportional to 129,403.80, 178,128.18 and 111,557.88

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Solution

The fourth proportional to 129,403.80, 178,128.18 and 111,557.88 is: 153,562.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,403.80 : 178,128.18 = 111,557.88 : x
  2. Step 2: Convert to fraction form
    129,403.80/178,128.18 = 111,557.88/x
  3. Step 3: Cross multiply
    129,403.80x = 178,128.18 × 111,557.88
  4. Step 4: Simplify right side
    129,403.80x = 19,871,602,129.06
  5. Step 5: Solve for x
    x = 19,871,602,129.06/129,403.80
  6. Step 6: Final answer
    x = 153,562.74

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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.