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Finding the Fourth Proportional to 111,585.12, 153,986.04 and 61,280.88

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Solution

The fourth proportional to 111,585.12, 153,986.04 and 61,280.88 is: 84,566.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,585.12 : 153,986.04 = 61,280.88 : x
  2. Step 2: Convert to fraction form
    111,585.12/153,986.04 = 61,280.88/x
  3. Step 3: Cross multiply
    111,585.12x = 153,986.04 × 61,280.88
  4. Step 4: Simplify right side
    111,585.12x = 9,436,400,038.92
  5. Step 5: Solve for x
    x = 9,436,400,038.92/111,585.12
  6. Step 6: Final answer
    x = 84,566.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.