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Finding the Fourth Proportional to 86,657.80, 129,986.70 and 36,729.40

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Solution

The fourth proportional to 86,657.80, 129,986.70 and 36,729.40 is: 55,094.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,657.80 : 129,986.70 = 36,729.40 : x
  2. Step 2: Convert to fraction form
    86,657.80/129,986.70 = 36,729.40/x
  3. Step 3: Cross multiply
    86,657.80x = 129,986.70 × 36,729.40
  4. Step 4: Simplify right side
    86,657.80x = 4,774,333,498.98
  5. Step 5: Solve for x
    x = 4,774,333,498.98/86,657.80
  6. Step 6: Final answer
    x = 55,094.10

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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.