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Finding the Fourth Proportional to 105,639.75, 145,782.90 and 60,927.75

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Solution

The fourth proportional to 105,639.75, 145,782.90 and 60,927.75 is: 84,080.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,639.75 : 145,782.90 = 60,927.75 : x
  2. Step 2: Convert to fraction form
    105,639.75/145,782.90 = 60,927.75/x
  3. Step 3: Cross multiply
    105,639.75x = 145,782.90 × 60,927.75
  4. Step 4: Simplify right side
    105,639.75x = 8,882,224,085.48
  5. Step 5: Solve for x
    x = 8,882,224,085.48/105,639.75
  6. Step 6: Final answer
    x = 84,080.32

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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.