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Finding the Fourth Proportional to 91,438.80, 137,158.20 and 90,855.60

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Solution

The fourth proportional to 91,438.80, 137,158.20 and 90,855.60 is: 136,283.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,438.80 : 137,158.20 = 90,855.60 : x
  2. Step 2: Convert to fraction form
    91,438.80/137,158.20 = 90,855.60/x
  3. Step 3: Cross multiply
    91,438.80x = 137,158.20 × 90,855.60
  4. Step 4: Simplify right side
    91,438.80x = 12,461,590,555.92
  5. Step 5: Solve for x
    x = 12,461,590,555.92/91,438.80
  6. Step 6: Final answer
    x = 136,283.40

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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.