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Finding the Fourth Proportional to 66,648.61, 91,966.08 and 42,807.61

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Solution

The fourth proportional to 66,648.61, 91,966.08 and 42,807.61 is: 59,068.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,648.61 : 91,966.08 = 42,807.61 : x
  2. Step 2: Convert to fraction form
    66,648.61/91,966.08 = 42,807.61/x
  3. Step 3: Cross multiply
    66,648.61x = 91,966.08 × 42,807.61
  4. Step 4: Simplify right side
    66,648.61x = 3,936,848,085.87
  5. Step 5: Solve for x
    x = 3,936,848,085.87/66,648.61
  6. Step 6: Final answer
    x = 59,068.72

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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.