Home / 105,712.20-145,881.72-57,965.40

Finding the Fourth Proportional to 105,712.20, 145,881.72 and 57,965.40

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Solution

The fourth proportional to 105,712.20, 145,881.72 and 57,965.40 is: 79,991.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,712.20 : 145,881.72 = 57,965.40 : x
  2. Step 2: Convert to fraction form
    105,712.20/145,881.72 = 57,965.40/x
  3. Step 3: Cross multiply
    105,712.20x = 145,881.72 × 57,965.40
  4. Step 4: Simplify right side
    105,712.20x = 8,456,092,252.49
  5. Step 5: Solve for x
    x = 8,456,092,252.49/105,712.20
  6. Step 6: Final answer
    x = 79,991.64

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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.