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Finding the Fourth Proportional to 64,881.40, 89,542.59 and 39,381.89

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Solution

The fourth proportional to 64,881.40, 89,542.59 and 39,381.89 is: 54,350.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,881.40 : 89,542.59 = 39,381.89 : x
  2. Step 2: Convert to fraction form
    64,881.40/89,542.59 = 39,381.89/x
  3. Step 3: Cross multiply
    64,881.40x = 89,542.59 × 39,381.89
  4. Step 4: Simplify right side
    64,881.40x = 3,526,355,981.98
  5. Step 5: Solve for x
    x = 3,526,355,981.98/64,881.40
  6. Step 6: Final answer
    x = 54,350.80

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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.