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Finding the Fourth Proportional to 66,689.74, 91,988.48 and 42,778.54

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Solution

The fourth proportional to 66,689.74, 91,988.48 and 42,778.54 is: 59,006.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,689.74 : 91,988.48 = 42,778.54 : x
  2. Step 2: Convert to fraction form
    66,689.74/91,988.48 = 42,778.54/x
  3. Step 3: Cross multiply
    66,689.74x = 91,988.48 × 42,778.54
  4. Step 4: Simplify right side
    66,689.74x = 3,935,132,871.22
  5. Step 5: Solve for x
    x = 3,935,132,871.22/66,689.74
  6. Step 6: Final answer
    x = 59,006.57

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1.5x scale

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.