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Finding the Fourth Proportional to 70,318.74, 105,464.67 and 21,070.74

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Solution

The fourth proportional to 70,318.74, 105,464.67 and 21,070.74 is: 31,602.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,318.74 : 105,464.67 = 21,070.74 : x
  2. Step 2: Convert to fraction form
    70,318.74/105,464.67 = 21,070.74/x
  3. Step 3: Cross multiply
    70,318.74x = 105,464.67 × 21,070.74
  4. Step 4: Simplify right side
    70,318.74x = 2,222,218,640.76
  5. Step 5: Solve for x
    x = 2,222,218,640.76/70,318.74
  6. Step 6: Final answer
    x = 31,602.08

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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.