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Finding the Fourth Proportional to 66,503.68, 91,762.40 and 39,648.64

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Solution

The fourth proportional to 66,503.68, 91,762.40 and 39,648.64 is: 54,707.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,503.68 : 91,762.40 = 39,648.64 : x
  2. Step 2: Convert to fraction form
    66,503.68/91,762.40 = 39,648.64/x
  3. Step 3: Cross multiply
    66,503.68x = 91,762.40 × 39,648.64
  4. Step 4: Simplify right side
    66,503.68x = 3,638,254,363.14
  5. Step 5: Solve for x
    x = 3,638,254,363.14/66,503.68
  6. Step 6: Final answer
    x = 54,707.56

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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.