Home / 99,990.40-149,985.60-40,787.20

Finding the Fourth Proportional to 99,990.40, 149,985.60 and 40,787.20

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Solution

The fourth proportional to 99,990.40, 149,985.60 and 40,787.20 is: 61,180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,990.40 : 149,985.60 = 40,787.20 : x
  2. Step 2: Convert to fraction form
    99,990.40/149,985.60 = 40,787.20/x
  3. Step 3: Cross multiply
    99,990.40x = 149,985.60 × 40,787.20
  4. Step 4: Simplify right side
    99,990.40x = 6,117,492,664.32
  5. Step 5: Solve for x
    x = 6,117,492,664.32/99,990.40
  6. Step 6: Final answer
    x = 61,180.80

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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.