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Finding the Fourth Proportional to 61,985.80, 92,978.70 and 19,865.80

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Solution

The fourth proportional to 61,985.80, 92,978.70 and 19,865.80 is: 29,798.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,985.80 : 92,978.70 = 19,865.80 : x
  2. Step 2: Convert to fraction form
    61,985.80/92,978.70 = 19,865.80/x
  3. Step 3: Cross multiply
    61,985.80x = 92,978.70 × 19,865.80
  4. Step 4: Simplify right side
    61,985.80x = 1,847,096,258.46
  5. Step 5: Solve for x
    x = 1,847,096,258.46/61,985.80
  6. Step 6: Final answer
    x = 29,798.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.