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Finding the Fourth Proportional to 66,810.48, 91,988.64 and 56,718

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Solution

The fourth proportional to 66,810.48, 91,988.64 and 56,718 is: 78,092.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,810.48 : 91,988.64 = 56,718 : x
  2. Step 2: Convert to fraction form
    66,810.48/91,988.64 = 56,718/x
  3. Step 3: Cross multiply
    66,810.48x = 91,988.64 × 56,718
  4. Step 4: Simplify right side
    66,810.48x = 5,217,411,683.52
  5. Step 5: Solve for x
    x = 5,217,411,683.52/66,810.48
  6. Step 6: Final answer
    x = 78,092.71

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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.