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Finding the Fourth Proportional to 91,384.80, 137,077.20 and 76,869.60

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Solution

The fourth proportional to 91,384.80, 137,077.20 and 76,869.60 is: 115,304.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,384.80 : 137,077.20 = 76,869.60 : x
  2. Step 2: Convert to fraction form
    91,384.80/137,077.20 = 76,869.60/x
  3. Step 3: Cross multiply
    91,384.80x = 137,077.20 × 76,869.60
  4. Step 4: Simplify right side
    91,384.80x = 10,537,069,533.12
  5. Step 5: Solve for x
    x = 10,537,069,533.12/91,384.80
  6. Step 6: Final answer
    x = 115,304.40

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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.