Home / 105,378.21-145,421.61-56,979.80

Finding the Fourth Proportional to 105,378.21, 145,421.61 and 56,979.80

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Solution

The fourth proportional to 105,378.21, 145,421.61 and 56,979.80 is: 78,631.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,378.21 : 145,421.61 = 56,979.80 : x
  2. Step 2: Convert to fraction form
    105,378.21/145,421.61 = 56,979.80/x
  3. Step 3: Cross multiply
    105,378.21x = 145,421.61 × 56,979.80
  4. Step 4: Simplify right side
    105,378.21x = 8,286,094,996.53
  5. Step 5: Solve for x
    x = 8,286,094,996.53/105,378.21
  6. Step 6: Final answer
    x = 78,631.96

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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.