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Finding the Fourth Proportional to 66,719.61, 92,070.36 and 39,876.93

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Solution

The fourth proportional to 66,719.61, 92,070.36 and 39,876.93 is: 55,028.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,719.61 : 92,070.36 = 39,876.93 : x
  2. Step 2: Convert to fraction form
    66,719.61/92,070.36 = 39,876.93/x
  3. Step 3: Cross multiply
    66,719.61x = 92,070.36 × 39,876.93
  4. Step 4: Simplify right side
    66,719.61x = 3,671,483,300.79
  5. Step 5: Solve for x
    x = 3,671,483,300.79/66,719.61
  6. Step 6: Final answer
    x = 55,028.55

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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.