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Finding the Fourth Proportional to 105,280.80, 157,690.80 and 91,456.80

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Solution

The fourth proportional to 105,280.80, 157,690.80 and 91,456.80 is: 136,985.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,280.80 : 157,690.80 = 91,456.80 : x
  2. Step 2: Convert to fraction form
    105,280.80/157,690.80 = 91,456.80/x
  3. Step 3: Cross multiply
    105,280.80x = 157,690.80 × 91,456.80
  4. Step 4: Simplify right side
    105,280.80x = 14,421,895,957.44
  5. Step 5: Solve for x
    x = 14,421,895,957.44/105,280.80
  6. Step 6: Final answer
    x = 136,985.05

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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.