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Finding the Fourth Proportional to 72,931.34, 109,415.48 and 20,340.84

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Solution

The fourth proportional to 72,931.34, 109,415.48 and 20,340.84 is: 30,516.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,931.34 : 109,415.48 = 20,340.84 : x
  2. Step 2: Convert to fraction form
    72,931.34/109,415.48 = 20,340.84/x
  3. Step 3: Cross multiply
    72,931.34x = 109,415.48 × 20,340.84
  4. Step 4: Simplify right side
    72,931.34x = 2,225,602,772.20
  5. Step 5: Solve for x
    x = 2,225,602,772.20/72,931.34
  6. Step 6: Final answer
    x = 30,516.41

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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.