Home / 129,362.84-178,519.02-72,774.20

Finding the Fourth Proportional to 129,362.84, 178,519.02 and 72,774.20

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Solution

The fourth proportional to 129,362.84, 178,519.02 and 72,774.20 is: 100,427.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,362.84 : 178,519.02 = 72,774.20 : x
  2. Step 2: Convert to fraction form
    129,362.84/178,519.02 = 72,774.20/x
  3. Step 3: Cross multiply
    129,362.84x = 178,519.02 × 72,774.20
  4. Step 4: Simplify right side
    129,362.84x = 12,991,578,865.28
  5. Step 5: Solve for x
    x = 12,991,578,865.28/129,362.84
  6. Step 6: Final answer
    x = 100,427.44

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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.