Home / 78,143.40-117,215.10-25,558.20

Finding the Fourth Proportional to 78,143.40, 117,215.10 and 25,558.20

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Solution

The fourth proportional to 78,143.40, 117,215.10 and 25,558.20 is: 38,337.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,143.40 : 117,215.10 = 25,558.20 : x
  2. Step 2: Convert to fraction form
    78,143.40/117,215.10 = 25,558.20/x
  3. Step 3: Cross multiply
    78,143.40x = 117,215.10 × 25,558.20
  4. Step 4: Simplify right side
    78,143.40x = 2,995,806,968.82
  5. Step 5: Solve for x
    x = 2,995,806,968.82/78,143.40
  6. Step 6: Final answer
    x = 38,337.30

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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.