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Finding the Fourth Proportional to 86,666.70, 130,000.05 and 72,669.90

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Solution

The fourth proportional to 86,666.70, 130,000.05 and 72,669.90 is: 109,004.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,666.70 : 130,000.05 = 72,669.90 : x
  2. Step 2: Convert to fraction form
    86,666.70/130,000.05 = 72,669.90/x
  3. Step 3: Cross multiply
    86,666.70x = 130,000.05 × 72,669.90
  4. Step 4: Simplify right side
    86,666.70x = 9,447,090,633.50
  5. Step 5: Solve for x
    x = 9,447,090,633.50/86,666.70
  6. Step 6: Final answer
    x = 109,004.85

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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.