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Finding the Fourth Proportional to 342,013.20, 513,019.80 and 105,428.40

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Solution

The fourth proportional to 342,013.20, 513,019.80 and 105,428.40 is: 158,142.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,013.20 : 513,019.80 = 105,428.40 : x
  2. Step 2: Convert to fraction form
    342,013.20/513,019.80 = 105,428.40/x
  3. Step 3: Cross multiply
    342,013.20x = 513,019.80 × 105,428.40
  4. Step 4: Simplify right side
    342,013.20x = 54,086,856,682.32
  5. Step 5: Solve for x
    x = 54,086,856,682.32/342,013.20
  6. Step 6: Final answer
    x = 158,142.60

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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.