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Finding the Fourth Proportional to 66,087, 91,139.56 and 43,417

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Solution

The fourth proportional to 66,087, 91,139.56 and 43,417 is: 59,875.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,087 : 91,139.56 = 43,417 : x
  2. Step 2: Convert to fraction form
    66,087/91,139.56 = 43,417/x
  3. Step 3: Cross multiply
    66,087x = 91,139.56 × 43,417
  4. Step 4: Simplify right side
    66,087x = 3,957,006,276.52
  5. Step 5: Solve for x
    x = 3,957,006,276.52/66,087
  6. Step 6: Final answer
    x = 59,875.71

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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.