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Finding the Fourth Proportional to 142,555.48, 196,718.40 and 78,889.48

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Solution

The fourth proportional to 142,555.48, 196,718.40 and 78,889.48 is: 108,862.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,555.48 : 196,718.40 = 78,889.48 : x
  2. Step 2: Convert to fraction form
    142,555.48/196,718.40 = 78,889.48/x
  3. Step 3: Cross multiply
    142,555.48x = 196,718.40 × 78,889.48
  4. Step 4: Simplify right side
    142,555.48x = 15,519,012,282.43
  5. Step 5: Solve for x
    x = 15,519,012,282.43/142,555.48
  6. Step 6: Final answer
    x = 108,862.97

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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.