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Finding the Fourth Proportional to 91,238.40, 136,987.20 and 56,246.40

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Solution

The fourth proportional to 91,238.40, 136,987.20 and 56,246.40 is: 84,449.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,238.40 : 136,987.20 = 56,246.40 : x
  2. Step 2: Convert to fraction form
    91,238.40/136,987.20 = 56,246.40/x
  3. Step 3: Cross multiply
    91,238.40x = 136,987.20 × 56,246.40
  4. Step 4: Simplify right side
    91,238.40x = 7,705,036,846.08
  5. Step 5: Solve for x
    x = 7,705,036,846.08/91,238.40
  6. Step 6: Final answer
    x = 84,449.50

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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.