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Finding the Fourth Proportional to 128,994.17, 178,005.95 and 71,637.12

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Solution

The fourth proportional to 128,994.17, 178,005.95 and 71,637.12 is: 98,855.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,994.17 : 178,005.95 = 71,637.12 : x
  2. Step 2: Convert to fraction form
    128,994.17/178,005.95 = 71,637.12/x
  3. Step 3: Cross multiply
    128,994.17x = 178,005.95 × 71,637.12
  4. Step 4: Simplify right side
    128,994.17x = 12,751,833,242.68
  5. Step 5: Solve for x
    x = 12,751,833,242.68/128,994.17
  6. Step 6: Final answer
    x = 98,855.89

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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.