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Finding the Fourth Proportional to 65,866.40, 90,913.20 and 40,701.68

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Solution

The fourth proportional to 65,866.40, 90,913.20 and 40,701.68 is: 56,179.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,866.40 : 90,913.20 = 40,701.68 : x
  2. Step 2: Convert to fraction form
    65,866.40/90,913.20 = 40,701.68/x
  3. Step 3: Cross multiply
    65,866.40x = 90,913.20 × 40,701.68
  4. Step 4: Simplify right side
    65,866.40x = 3,700,319,974.18
  5. Step 5: Solve for x
    x = 3,700,319,974.18/65,866.40
  6. Step 6: Final answer
    x = 56,179.17

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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.