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Finding the Fourth Proportional to 70,346.78, 105,520.17 and 21,098.78

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Solution

The fourth proportional to 70,346.78, 105,520.17 and 21,098.78 is: 31,648.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,346.78 : 105,520.17 = 21,098.78 : x
  2. Step 2: Convert to fraction form
    70,346.78/105,520.17 = 21,098.78/x
  3. Step 3: Cross multiply
    70,346.78x = 105,520.17 × 21,098.78
  4. Step 4: Simplify right side
    70,346.78x = 2,226,346,852.39
  5. Step 5: Solve for x
    x = 2,226,346,852.39/70,346.78
  6. Step 6: Final answer
    x = 31,648.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.