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Finding the Fourth Proportional to 85,237.90, 117,678.70 and 75,780.28

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Solution

The fourth proportional to 85,237.90, 117,678.70 and 75,780.28 is: 104,621.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,237.90 : 117,678.70 = 75,780.28 : x
  2. Step 2: Convert to fraction form
    85,237.90/117,678.70 = 75,780.28/x
  3. Step 3: Cross multiply
    85,237.90x = 117,678.70 × 75,780.28
  4. Step 4: Simplify right side
    85,237.90x = 8,917,724,651.60
  5. Step 5: Solve for x
    x = 8,917,724,651.60/85,237.90
  6. Step 6: Final answer
    x = 104,621.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.