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Finding the Fourth Proportional to 78,431.40, 108,235.44 and 42,621.84

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Solution

The fourth proportional to 78,431.40, 108,235.44 and 42,621.84 is: 58,818.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,431.40 : 108,235.44 = 42,621.84 : x
  2. Step 2: Convert to fraction form
    78,431.40/108,235.44 = 42,621.84/x
  3. Step 3: Cross multiply
    78,431.40x = 108,235.44 × 42,621.84
  4. Step 4: Simplify right side
    78,431.40x = 4,613,193,606.01
  5. Step 5: Solve for x
    x = 4,613,193,606.01/78,431.40
  6. Step 6: Final answer
    x = 58,818.20

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1.5x scale

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.