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Finding the Fourth Proportional to 65,678.61, 90,601.45 and 40,197.32

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Solution

The fourth proportional to 65,678.61, 90,601.45 and 40,197.32 is: 55,450.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,678.61 : 90,601.45 = 40,197.32 : x
  2. Step 2: Convert to fraction form
    65,678.61/90,601.45 = 40,197.32/x
  3. Step 3: Cross multiply
    65,678.61x = 90,601.45 × 40,197.32
  4. Step 4: Simplify right side
    65,678.61x = 3,641,935,478.11
  5. Step 5: Solve for x
    x = 3,641,935,478.11/65,678.61
  6. Step 6: Final answer
    x = 55,450.87

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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.