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Finding the Fourth Proportional to 119,643.78, 165,115.76 and 65,928.77

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Solution

The fourth proportional to 119,643.78, 165,115.76 and 65,928.77 is: 90,985.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,643.78 : 165,115.76 = 65,928.77 : x
  2. Step 2: Convert to fraction form
    119,643.78/165,115.76 = 65,928.77/x
  3. Step 3: Cross multiply
    119,643.78x = 165,115.76 × 65,928.77
  4. Step 4: Simplify right side
    119,643.78x = 10,885,877,809.19
  5. Step 5: Solve for x
    x = 10,885,877,809.19/119,643.78
  6. Step 6: Final answer
    x = 90,985.74

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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.