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Finding the Fourth Proportional to 86,670.30, 130,005.45 and 70,923.90

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Solution

The fourth proportional to 86,670.30, 130,005.45 and 70,923.90 is: 106,385.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,670.30 : 130,005.45 = 70,923.90 : x
  2. Step 2: Convert to fraction form
    86,670.30/130,005.45 = 70,923.90/x
  3. Step 3: Cross multiply
    86,670.30x = 130,005.45 × 70,923.90
  4. Step 4: Simplify right side
    86,670.30x = 9,220,493,535.26
  5. Step 5: Solve for x
    x = 9,220,493,535.26/86,670.30
  6. Step 6: Final answer
    x = 106,385.85

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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.