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Finding the Fourth Proportional to 135,303.90, 186,756.90 and 78,726.20

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Solution

The fourth proportional to 135,303.90, 186,756.90 and 78,726.20 is: 108,663.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,303.90 : 186,756.90 = 78,726.20 : x
  2. Step 2: Convert to fraction form
    135,303.90/186,756.90 = 78,726.20/x
  3. Step 3: Cross multiply
    135,303.90x = 186,756.90 × 78,726.20
  4. Step 4: Simplify right side
    135,303.90x = 14,702,661,060.78
  5. Step 5: Solve for x
    x = 14,702,661,060.78/135,303.90
  6. Step 6: Final answer
    x = 108,663.99

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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.