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Finding the Fourth Proportional to 70,565.48, 105,821.56 and 28,431.28

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Solution

The fourth proportional to 70,565.48, 105,821.56 and 28,431.28 is: 42,636.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,565.48 : 105,821.56 = 28,431.28 : x
  2. Step 2: Convert to fraction form
    70,565.48/105,821.56 = 28,431.28/x
  3. Step 3: Cross multiply
    70,565.48x = 105,821.56 × 28,431.28
  4. Step 4: Simplify right side
    70,565.48x = 3,008,642,402.40
  5. Step 5: Solve for x
    x = 3,008,642,402.40/70,565.48
  6. Step 6: Final answer
    x = 42,636.18

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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.