Home / 129,315.40-178,465.62-72,723.40

Finding the Fourth Proportional to 129,315.40, 178,465.62 and 72,723.40

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Solution

The fourth proportional to 129,315.40, 178,465.62 and 72,723.40 is: 100,364.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,315.40 : 178,465.62 = 72,723.40 : x
  2. Step 2: Convert to fraction form
    129,315.40/178,465.62 = 72,723.40/x
  3. Step 3: Cross multiply
    129,315.40x = 178,465.62 × 72,723.40
  4. Step 4: Simplify right side
    129,315.40x = 12,978,626,669.51
  5. Step 5: Solve for x
    x = 12,978,626,669.51/129,315.40
  6. Step 6: Final answer
    x = 100,364.12

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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.