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Finding the Fourth Proportional to 78,304.32, 117,455.87 and 19,139.49

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Solution

The fourth proportional to 78,304.32, 117,455.87 and 19,139.49 is: 28,709.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,304.32 : 117,455.87 = 19,139.49 : x
  2. Step 2: Convert to fraction form
    78,304.32/117,455.87 = 19,139.49/x
  3. Step 3: Cross multiply
    78,304.32x = 117,455.87 × 19,139.49
  4. Step 4: Simplify right side
    78,304.32x = 2,248,045,497.16
  5. Step 5: Solve for x
    x = 2,248,045,497.16/78,304.32
  6. Step 6: Final answer
    x = 28,709.09

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1.5x scale

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.