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Finding the Fourth Proportional to 85,518.70, 128,223.72 and 75,009.82

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Solution

The fourth proportional to 85,518.70, 128,223.72 and 75,009.82 is: 112,467.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,518.70 : 128,223.72 = 75,009.82 : x
  2. Step 2: Convert to fraction form
    85,518.70/128,223.72 = 75,009.82/x
  3. Step 3: Cross multiply
    85,518.70x = 128,223.72 × 75,009.82
  4. Step 4: Simplify right side
    85,518.70x = 9,618,038,068.23
  5. Step 5: Solve for x
    x = 9,618,038,068.23/85,518.70
  6. Step 6: Final answer
    x = 112,467.08

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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.