Home / 78,621.81-108,494.40-42,811.68

Finding the Fourth Proportional to 78,621.81, 108,494.40 and 42,811.68

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Solution

The fourth proportional to 78,621.81, 108,494.40 and 42,811.68 is: 59,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,621.81 : 108,494.40 = 42,811.68 : x
  2. Step 2: Convert to fraction form
    78,621.81/108,494.40 = 42,811.68/x
  3. Step 3: Cross multiply
    78,621.81x = 108,494.40 × 42,811.68
  4. Step 4: Simplify right side
    78,621.81x = 4,644,827,534.59
  5. Step 5: Solve for x
    x = 4,644,827,534.59/78,621.81
  6. Step 6: Final answer
    x = 59,078.10

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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.