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Finding the Fourth Proportional to 91,913.40, 137,870.10 and 60,420.60

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Solution

The fourth proportional to 91,913.40, 137,870.10 and 60,420.60 is: 90,630.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,913.40 : 137,870.10 = 60,420.60 : x
  2. Step 2: Convert to fraction form
    91,913.40/137,870.10 = 60,420.60/x
  3. Step 3: Cross multiply
    91,913.40x = 137,870.10 × 60,420.60
  4. Step 4: Simplify right side
    91,913.40x = 8,330,194,164.06
  5. Step 5: Solve for x
    x = 8,330,194,164.06/91,913.40
  6. Step 6: Final answer
    x = 90,630.90

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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.