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Finding the Fourth Proportional to 66,985.76, 92,440.96 and 38,690.80

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Solution

The fourth proportional to 66,985.76, 92,440.96 and 38,690.80 is: 53,393.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,985.76 : 92,440.96 = 38,690.80 : x
  2. Step 2: Convert to fraction form
    66,985.76/92,440.96 = 38,690.80/x
  3. Step 3: Cross multiply
    66,985.76x = 92,440.96 × 38,690.80
  4. Step 4: Simplify right side
    66,985.76x = 3,576,614,695.17
  5. Step 5: Solve for x
    x = 3,576,614,695.17/66,985.76
  6. Step 6: Final answer
    x = 53,393.66

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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.