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Finding the Fourth Proportional to 115,129, 172,685.58 and 70,762.60

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Solution

The fourth proportional to 115,129, 172,685.58 and 70,762.60 is: 106,139.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,129 : 172,685.58 = 70,762.60 : x
  2. Step 2: Convert to fraction form
    115,129/172,685.58 = 70,762.60/x
  3. Step 3: Cross multiply
    115,129x = 172,685.58 × 70,762.60
  4. Step 4: Simplify right side
    115,129x = 12,219,680,623.31
  5. Step 5: Solve for x
    x = 12,219,680,623.31/115,129
  6. Step 6: Final answer
    x = 106,139.03

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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.