Home / 78,500.64-108,329.40-42,690.36

Finding the Fourth Proportional to 78,500.64, 108,329.40 and 42,690.36

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Solution

The fourth proportional to 78,500.64, 108,329.40 and 42,690.36 is: 58,911.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,500.64 : 108,329.40 = 42,690.36 : x
  2. Step 2: Convert to fraction form
    78,500.64/108,329.40 = 42,690.36/x
  3. Step 3: Cross multiply
    78,500.64x = 108,329.40 × 42,690.36
  4. Step 4: Simplify right side
    78,500.64x = 4,624,621,084.58
  5. Step 5: Solve for x
    x = 4,624,621,084.58/78,500.64
  6. Step 6: Final answer
    x = 58,911.89

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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.