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Finding the Fourth Proportional to 65,718.60, 90,698.80 and 40,242.12

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Solution

The fourth proportional to 65,718.60, 90,698.80 and 40,242.12 is: 55,538.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,718.60 : 90,698.80 = 40,242.12 : x
  2. Step 2: Convert to fraction form
    65,718.60/90,698.80 = 40,242.12/x
  3. Step 3: Cross multiply
    65,718.60x = 90,698.80 × 40,242.12
  4. Step 4: Simplify right side
    65,718.60x = 3,649,911,993.46
  5. Step 5: Solve for x
    x = 3,649,911,993.46/65,718.60
  6. Step 6: Final answer
    x = 55,538.49

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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.