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Finding the Fourth Proportional to 65,440.71, 90,305.72 and 39,989.63

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Solution

The fourth proportional to 65,440.71, 90,305.72 and 39,989.63 is: 55,184.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,440.71 : 90,305.72 = 39,989.63 : x
  2. Step 2: Convert to fraction form
    65,440.71/90,305.72 = 39,989.63/x
  3. Step 3: Cross multiply
    65,440.71x = 90,305.72 × 39,989.63
  4. Step 4: Simplify right side
    65,440.71x = 3,611,292,505.46
  5. Step 5: Solve for x
    x = 3,611,292,505.46/65,440.71
  6. Step 6: Final answer
    x = 55,184.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.