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Finding the Fourth Proportional to 66,503.79, 91,762.61 and 39,648.78

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Solution

The fourth proportional to 66,503.79, 91,762.61 and 39,648.78 is: 54,707.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,503.79 : 91,762.61 = 39,648.78 : x
  2. Step 2: Convert to fraction form
    66,503.79/91,762.61 = 39,648.78/x
  3. Step 3: Cross multiply
    66,503.79x = 91,762.61 × 39,648.78
  4. Step 4: Simplify right side
    66,503.79x = 3,638,275,337.87
  5. Step 5: Solve for x
    x = 3,638,275,337.87/66,503.79
  6. Step 6: Final answer
    x = 54,707.79

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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.