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Finding the Fourth Proportional to 132,415.40, 198,623.10 and 76,428.20

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Solution

The fourth proportional to 132,415.40, 198,623.10 and 76,428.20 is: 114,642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,415.40 : 198,623.10 = 76,428.20 : x
  2. Step 2: Convert to fraction form
    132,415.40/198,623.10 = 76,428.20/x
  3. Step 3: Cross multiply
    132,415.40x = 198,623.10 × 76,428.20
  4. Step 4: Simplify right side
    132,415.40x = 15,180,406,011.42
  5. Step 5: Solve for x
    x = 15,180,406,011.42/132,415.40
  6. Step 6: Final answer
    x = 114,642.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.