Home / 142,143.90-196,157.28-78,480.30

Finding the Fourth Proportional to 142,143.90, 196,157.28 and 78,480.30

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Solution

The fourth proportional to 142,143.90, 196,157.28 and 78,480.30 is: 108,302.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,143.90 : 196,157.28 = 78,480.30 : x
  2. Step 2: Convert to fraction form
    142,143.90/196,157.28 = 78,480.30/x
  3. Step 3: Cross multiply
    142,143.90x = 196,157.28 × 78,480.30
  4. Step 4: Simplify right side
    142,143.90x = 15,394,482,181.58
  5. Step 5: Solve for x
    x = 15,394,482,181.58/142,143.90
  6. Step 6: Final answer
    x = 108,302.10

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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.