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Finding the Fourth Proportional to 91,869.40, 137,804.10 and 90,640.60

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Solution

The fourth proportional to 91,869.40, 137,804.10 and 90,640.60 is: 135,960.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,869.40 : 137,804.10 = 90,640.60 : x
  2. Step 2: Convert to fraction form
    91,869.40/137,804.10 = 90,640.60/x
  3. Step 3: Cross multiply
    91,869.40x = 137,804.10 × 90,640.60
  4. Step 4: Simplify right side
    91,869.40x = 12,490,646,306.46
  5. Step 5: Solve for x
    x = 12,490,646,306.46/91,869.40
  6. Step 6: Final answer
    x = 135,960.90

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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.