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Finding the Fourth Proportional to 85,565.34, 128,348.28 and 38,763.54

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Solution

The fourth proportional to 85,565.34, 128,348.28 and 38,763.54 is: 58,145.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,565.34 : 128,348.28 = 38,763.54 : x
  2. Step 2: Convert to fraction form
    85,565.34/128,348.28 = 38,763.54/x
  3. Step 3: Cross multiply
    85,565.34x = 128,348.28 × 38,763.54
  4. Step 4: Simplify right side
    85,565.34x = 4,975,233,685.71
  5. Step 5: Solve for x
    x = 4,975,233,685.71/85,565.34
  6. Step 6: Final answer
    x = 58,145.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.