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Finding the Fourth Proportional to 105,615.39, 145,694.79 and 71,612.40

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Solution

The fourth proportional to 105,615.39, 145,694.79 and 71,612.40 is: 98,788.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,615.39 : 145,694.79 = 71,612.40 : x
  2. Step 2: Convert to fraction form
    105,615.39/145,694.79 = 71,612.40/x
  3. Step 3: Cross multiply
    105,615.39x = 145,694.79 × 71,612.40
  4. Step 4: Simplify right side
    105,615.39x = 10,433,553,579.40
  5. Step 5: Solve for x
    x = 10,433,553,579.40/105,615.39
  6. Step 6: Final answer
    x = 98,788.19

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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.