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Finding the Fourth Proportional to 70,405.64, 105,356.82 and 61,154.66

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Solution

The fourth proportional to 70,405.64, 105,356.82 and 61,154.66 is: 91,513.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,405.64 : 105,356.82 = 61,154.66 : x
  2. Step 2: Convert to fraction form
    70,405.64/105,356.82 = 61,154.66/x
  3. Step 3: Cross multiply
    70,405.64x = 105,356.82 × 61,154.66
  4. Step 4: Simplify right side
    70,405.64x = 6,443,060,505.78
  5. Step 5: Solve for x
    x = 6,443,060,505.78/70,405.64
  6. Step 6: Final answer
    x = 91,513.41

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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.