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Finding the Fourth Proportional to 142,653.69, 196,859.68 and 78,990.12

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Solution

The fourth proportional to 142,653.69, 196,859.68 and 78,990.12 is: 109,005.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,653.69 : 196,859.68 = 78,990.12 : x
  2. Step 2: Convert to fraction form
    142,653.69/196,859.68 = 78,990.12/x
  3. Step 3: Cross multiply
    142,653.69x = 196,859.68 × 78,990.12
  4. Step 4: Simplify right side
    142,653.69x = 15,549,969,746.36
  5. Step 5: Solve for x
    x = 15,549,969,746.36/142,653.69
  6. Step 6: Final answer
    x = 109,005.03

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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.