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Finding the Fourth Proportional to 91,382.40, 137,203.20 and 56,390.40

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Solution

The fourth proportional to 91,382.40, 137,203.20 and 56,390.40 is: 84,665.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,382.40 : 137,203.20 = 56,390.40 : x
  2. Step 2: Convert to fraction form
    91,382.40/137,203.20 = 56,390.40/x
  3. Step 3: Cross multiply
    91,382.40x = 137,203.20 × 56,390.40
  4. Step 4: Simplify right side
    91,382.40x = 7,736,943,329.28
  5. Step 5: Solve for x
    x = 7,736,943,329.28/91,382.40
  6. Step 6: Final answer
    x = 84,665.57

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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.