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Finding the Fourth Proportional to 66,720, 92,029.86 and 42,808.80

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Solution

The fourth proportional to 66,720, 92,029.86 and 42,808.80 is: 59,048.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,720 : 92,029.86 = 42,808.80 : x
  2. Step 2: Convert to fraction form
    66,720/92,029.86 = 42,808.80/x
  3. Step 3: Cross multiply
    66,720x = 92,029.86 × 42,808.80
  4. Step 4: Simplify right side
    66,720x = 3,939,687,870.77
  5. Step 5: Solve for x
    x = 3,939,687,870.77/66,720
  6. Step 6: Final answer
    x = 59,048.08

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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.