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Finding the Fourth Proportional to 86,611.80, 129,852.90 and 47,213.40

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Solution

The fourth proportional to 86,611.80, 129,852.90 and 47,213.40 is: 70,784.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611.80 : 129,852.90 = 47,213.40 : x
  2. Step 2: Convert to fraction form
    86,611.80/129,852.90 = 47,213.40/x
  3. Step 3: Cross multiply
    86,611.80x = 129,852.90 × 47,213.40
  4. Step 4: Simplify right side
    86,611.80x = 6,130,796,908.86
  5. Step 5: Solve for x
    x = 6,130,796,908.86/86,611.80
  6. Step 6: Final answer
    x = 70,784.78

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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.