Home / 135,800.13-187,420.79-78,439.40

Finding the Fourth Proportional to 135,800.13, 187,420.79 and 78,439.40

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Solution

The fourth proportional to 135,800.13, 187,420.79 and 78,439.40 is: 108,255.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,800.13 : 187,420.79 = 78,439.40 : x
  2. Step 2: Convert to fraction form
    135,800.13/187,420.79 = 78,439.40/x
  3. Step 3: Cross multiply
    135,800.13x = 187,420.79 × 78,439.40
  4. Step 4: Simplify right side
    135,800.13x = 14,701,172,985.83
  5. Step 5: Solve for x
    x = 14,701,172,985.83/135,800.13
  6. Step 6: Final answer
    x = 108,255.96

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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.