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Finding the Fourth Proportional to 121,123.40, 181,620.30 and 42,240.20

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Solution

The fourth proportional to 121,123.40, 181,620.30 and 42,240.20 is: 63,337.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,123.40 : 181,620.30 = 42,240.20 : x
  2. Step 2: Convert to fraction form
    121,123.40/181,620.30 = 42,240.20/x
  3. Step 3: Cross multiply
    121,123.40x = 181,620.30 × 42,240.20
  4. Step 4: Simplify right side
    121,123.40x = 7,671,677,796.06
  5. Step 5: Solve for x
    x = 7,671,677,796.06/121,123.40
  6. Step 6: Final answer
    x = 63,337.70

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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.