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Finding the Fourth Proportional to 121,431.80, 182,014.05 and 42,505.40

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Solution

The fourth proportional to 121,431.80, 182,014.05 and 42,505.40 is: 63,711.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,431.80 : 182,014.05 = 42,505.40 : x
  2. Step 2: Convert to fraction form
    121,431.80/182,014.05 = 42,505.40/x
  3. Step 3: Cross multiply
    121,431.80x = 182,014.05 × 42,505.40
  4. Step 4: Simplify right side
    121,431.80x = 7,736,580,000.87
  5. Step 5: Solve for x
    x = 7,736,580,000.87/121,431.80
  6. Step 6: Final answer
    x = 63,711.32

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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.