Home / 103,615.20-155,422.80-66,290.40

Finding the Fourth Proportional to 103,615.20, 155,422.80 and 66,290.40

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Solution

The fourth proportional to 103,615.20, 155,422.80 and 66,290.40 is: 99,435.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,615.20 : 155,422.80 = 66,290.40 : x
  2. Step 2: Convert to fraction form
    103,615.20/155,422.80 = 66,290.40/x
  3. Step 3: Cross multiply
    103,615.20x = 155,422.80 × 66,290.40
  4. Step 4: Simplify right side
    103,615.20x = 10,303,039,581.12
  5. Step 5: Solve for x
    x = 10,303,039,581.12/103,615.20
  6. Step 6: Final answer
    x = 99,435.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.