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Finding the Fourth Proportional to 85,780.99, 118,422.57 and 66,617.77

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Solution

The fourth proportional to 85,780.99, 118,422.57 and 66,617.77 is: 91,967.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,780.99 : 118,422.57 = 66,617.77 : x
  2. Step 2: Convert to fraction form
    85,780.99/118,422.57 = 66,617.77/x
  3. Step 3: Cross multiply
    85,780.99x = 118,422.57 × 66,617.77
  4. Step 4: Simplify right side
    85,780.99x = 7,889,047,531.07
  5. Step 5: Solve for x
    x = 7,889,047,531.07/85,780.99
  6. Step 6: Final answer
    x = 91,967.32

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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.