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Finding the Fourth Proportional to 105,428.80, 158,143.20 and 100,878.40

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Solution

The fourth proportional to 105,428.80, 158,143.20 and 100,878.40 is: 151,317.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,428.80 : 158,143.20 = 100,878.40 : x
  2. Step 2: Convert to fraction form
    105,428.80/158,143.20 = 100,878.40/x
  3. Step 3: Cross multiply
    105,428.80x = 158,143.20 × 100,878.40
  4. Step 4: Simplify right side
    105,428.80x = 15,953,232,986.88
  5. Step 5: Solve for x
    x = 15,953,232,986.88/105,428.80
  6. Step 6: Final answer
    x = 151,317.60

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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.