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Finding the Fourth Proportional to 70,905.60, 106,444.80 and 70,387.20

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Solution

The fourth proportional to 70,905.60, 106,444.80 and 70,387.20 is: 105,666.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,905.60 : 106,444.80 = 70,387.20 : x
  2. Step 2: Convert to fraction form
    70,905.60/106,444.80 = 70,387.20/x
  3. Step 3: Cross multiply
    70,905.60x = 106,444.80 × 70,387.20
  4. Step 4: Simplify right side
    70,905.60x = 7,492,351,426.56
  5. Step 5: Solve for x
    x = 7,492,351,426.56/70,905.60
  6. Step 6: Final answer
    x = 105,666.57

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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.