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Finding the Fourth Proportional to 103,990.40, 155,985.60 and 87,077.60

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Solution

The fourth proportional to 103,990.40, 155,985.60 and 87,077.60 is: 130,616.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,990.40 : 155,985.60 = 87,077.60 : x
  2. Step 2: Convert to fraction form
    103,990.40/155,985.60 = 87,077.60/x
  3. Step 3: Cross multiply
    103,990.40x = 155,985.60 × 87,077.60
  4. Step 4: Simplify right side
    103,990.40x = 13,582,851,682.56
  5. Step 5: Solve for x
    x = 13,582,851,682.56/103,990.40
  6. Step 6: Final answer
    x = 130,616.40

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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.