Home / 142,120.80-196,123.08-78,457.32

Finding the Fourth Proportional to 142,120.80, 196,123.08 and 78,457.32

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Solution

The fourth proportional to 142,120.80, 196,123.08 and 78,457.32 is: 108,269.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,120.80 : 196,123.08 = 78,457.32 : x
  2. Step 2: Convert to fraction form
    142,120.80/196,123.08 = 78,457.32/x
  3. Step 3: Cross multiply
    142,120.80x = 196,123.08 × 78,457.32
  4. Step 4: Simplify right side
    142,120.80x = 15,387,291,246.95
  5. Step 5: Solve for x
    x = 15,387,291,246.95/142,120.80
  6. Step 6: Final answer
    x = 108,269.10

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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.