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Finding the Fourth Proportional to 65,441.71, 90,307.10 and 39,990.63

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Solution

The fourth proportional to 65,441.71, 90,307.10 and 39,990.63 is: 55,185.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,441.71 : 90,307.10 = 39,990.63 : x
  2. Step 2: Convert to fraction form
    65,441.71/90,307.10 = 39,990.63/x
  3. Step 3: Cross multiply
    65,441.71x = 90,307.10 × 39,990.63
  4. Step 4: Simplify right side
    65,441.71x = 3,611,437,822.47
  5. Step 5: Solve for x
    x = 3,611,437,822.47/65,441.71
  6. Step 6: Final answer
    x = 55,185.57

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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.