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Finding the Fourth Proportional to 86,655.30, 130,019.40 and 47,240.70

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Solution

The fourth proportional to 86,655.30, 130,019.40 and 47,240.70 is: 70,880.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,655.30 : 130,019.40 = 47,240.70 : x
  2. Step 2: Convert to fraction form
    86,655.30/130,019.40 = 47,240.70/x
  3. Step 3: Cross multiply
    86,655.30x = 130,019.40 × 47,240.70
  4. Step 4: Simplify right side
    86,655.30x = 6,142,207,469.58
  5. Step 5: Solve for x
    x = 6,142,207,469.58/86,655.30
  6. Step 6: Final answer
    x = 70,880.92

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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.