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Finding the Fourth Proportional to 62,990.64, 86,921.28 and 34,689.60

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Solution

The fourth proportional to 62,990.64, 86,921.28 and 34,689.60 is: 47,868.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,990.64 : 86,921.28 = 34,689.60 : x
  2. Step 2: Convert to fraction form
    62,990.64/86,921.28 = 34,689.60/x
  3. Step 3: Cross multiply
    62,990.64x = 86,921.28 × 34,689.60
  4. Step 4: Simplify right side
    62,990.64x = 3,015,264,434.69
  5. Step 5: Solve for x
    x = 3,015,264,434.69/62,990.64
  6. Step 6: Final answer
    x = 47,868.45

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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.