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Finding the Fourth Proportional to 74,390.76, 111,585.92 and 61,215.72

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Solution

The fourth proportional to 74,390.76, 111,585.92 and 61,215.72 is: 91,823.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,390.76 : 111,585.92 = 61,215.72 : x
  2. Step 2: Convert to fraction form
    74,390.76/111,585.92 = 61,215.72/x
  3. Step 3: Cross multiply
    74,390.76x = 111,585.92 × 61,215.72
  4. Step 4: Simplify right side
    74,390.76x = 6,830,812,434.66
  5. Step 5: Solve for x
    x = 6,830,812,434.66/74,390.76
  6. Step 6: Final answer
    x = 91,823.40

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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.