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Finding the Fourth Proportional to 40,659.40, 60,989.10 and 20,931.40

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Solution

The fourth proportional to 40,659.40, 60,989.10 and 20,931.40 is: 31,397.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,659.40 : 60,989.10 = 20,931.40 : x
  2. Step 2: Convert to fraction form
    40,659.40/60,989.10 = 20,931.40/x
  3. Step 3: Cross multiply
    40,659.40x = 60,989.10 × 20,931.40
  4. Step 4: Simplify right side
    40,659.40x = 1,276,587,247.74
  5. Step 5: Solve for x
    x = 1,276,587,247.74/40,659.40
  6. Step 6: Final answer
    x = 31,397.10

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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.