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Finding the Fourth Proportional to 72,015.40, 107,931.30 and 40,425.40

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Solution

The fourth proportional to 72,015.40, 107,931.30 and 40,425.40 is: 60,586.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,015.40 : 107,931.30 = 40,425.40 : x
  2. Step 2: Convert to fraction form
    72,015.40/107,931.30 = 40,425.40/x
  3. Step 3: Cross multiply
    72,015.40x = 107,931.30 × 40,425.40
  4. Step 4: Simplify right side
    72,015.40x = 4,363,165,975.02
  5. Step 5: Solve for x
    x = 4,363,165,975.02/72,015.40
  6. Step 6: Final answer
    x = 60,586.57

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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.