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Finding the Fourth Proportional to 70,503.72, 105,730.95 and 28,372.86

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Solution

The fourth proportional to 70,503.72, 105,730.95 and 28,372.86 is: 42,549.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,503.72 : 105,730.95 = 28,372.86 : x
  2. Step 2: Convert to fraction form
    70,503.72/105,730.95 = 28,372.86/x
  3. Step 3: Cross multiply
    70,503.72x = 105,730.95 × 28,372.86
  4. Step 4: Simplify right side
    70,503.72x = 2,999,889,442.02
  5. Step 5: Solve for x
    x = 2,999,889,442.02/70,503.72
  6. Step 6: Final answer
    x = 42,549.38

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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.