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Finding the Fourth Proportional to 65,445.35, 90,312.20 and 39,994.32

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Solution

The fourth proportional to 65,445.35, 90,312.20 and 39,994.32 is: 55,190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,445.35 : 90,312.20 = 39,994.32 : x
  2. Step 2: Convert to fraction form
    65,445.35/90,312.20 = 39,994.32/x
  3. Step 3: Cross multiply
    65,445.35x = 90,312.20 × 39,994.32
  4. Step 4: Simplify right side
    65,445.35x = 3,611,974,826.73
  5. Step 5: Solve for x
    x = 3,611,974,826.73/65,445.35
  6. Step 6: Final answer
    x = 55,190.70

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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.