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Finding the Fourth Proportional to 113,463.40, 170,259.90 and 78,428.20

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Solution

The fourth proportional to 113,463.40, 170,259.90 and 78,428.20 is: 117,687.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,463.40 : 170,259.90 = 78,428.20 : x
  2. Step 2: Convert to fraction form
    113,463.40/170,259.90 = 78,428.20/x
  3. Step 3: Cross multiply
    113,463.40x = 170,259.90 × 78,428.20
  4. Step 4: Simplify right side
    113,463.40x = 13,353,177,489.18
  5. Step 5: Solve for x
    x = 13,353,177,489.18/113,463.40
  6. Step 6: Final answer
    x = 117,687.09

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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.