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Finding the Fourth Proportional to 65,869.71, 90,875.86 and 43,239.45

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Solution

The fourth proportional to 65,869.71, 90,875.86 and 43,239.45 is: 59,654.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,869.71 : 90,875.86 = 43,239.45 : x
  2. Step 2: Convert to fraction form
    65,869.71/90,875.86 = 43,239.45/x
  3. Step 3: Cross multiply
    65,869.71x = 90,875.86 × 43,239.45
  4. Step 4: Simplify right side
    65,869.71x = 3,929,422,437.36
  5. Step 5: Solve for x
    x = 3,929,422,437.36/65,869.71
  6. Step 6: Final answer
    x = 59,654.47

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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.