Home / 129,291.78-178,421.49-72,703.56

Finding the Fourth Proportional to 129,291.78, 178,421.49 and 72,703.56

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Solution

The fourth proportional to 129,291.78, 178,421.49 and 72,703.56 is: 100,330.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,291.78 : 178,421.49 = 72,703.56 : x
  2. Step 2: Convert to fraction form
    129,291.78/178,421.49 = 72,703.56/x
  3. Step 3: Cross multiply
    129,291.78x = 178,421.49 × 72,703.56
  4. Step 4: Simplify right side
    129,291.78x = 12,971,877,503.50
  5. Step 5: Solve for x
    x = 12,971,877,503.50/129,291.78
  6. Step 6: Final answer
    x = 100,330.26

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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.