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Finding the Fourth Proportional to 70,621.56, 97,485.52 and 42,321.78

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Solution

The fourth proportional to 70,621.56, 97,485.52 and 42,321.78 is: 58,420.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,621.56 : 97,485.52 = 42,321.78 : x
  2. Step 2: Convert to fraction form
    70,621.56/97,485.52 = 42,321.78/x
  3. Step 3: Cross multiply
    70,621.56x = 97,485.52 × 42,321.78
  4. Step 4: Simplify right side
    70,621.56x = 4,125,760,730.63
  5. Step 5: Solve for x
    x = 4,125,760,730.63/70,621.56
  6. Step 6: Final answer
    x = 58,420.70

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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.