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Finding the Fourth Proportional to 86,611.80, 129,890.70 and 34,037.40

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Solution

The fourth proportional to 86,611.80, 129,890.70 and 34,037.40 is: 51,045.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611.80 : 129,890.70 = 34,037.40 : x
  2. Step 2: Convert to fraction form
    86,611.80/129,890.70 = 34,037.40/x
  3. Step 3: Cross multiply
    86,611.80x = 129,890.70 × 34,037.40
  4. Step 4: Simplify right side
    86,611.80x = 4,421,141,712.18
  5. Step 5: Solve for x
    x = 4,421,141,712.18/86,611.80
  6. Step 6: Final answer
    x = 51,045.49

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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.