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Finding the Fourth Proportional to 70,488.60, 105,708.31 and 28,357.76

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Solution

The fourth proportional to 70,488.60, 105,708.31 and 28,357.76 is: 42,526.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,488.60 : 105,708.31 = 28,357.76 : x
  2. Step 2: Convert to fraction form
    70,488.60/105,708.31 = 28,357.76/x
  3. Step 3: Cross multiply
    70,488.60x = 105,708.31 × 28,357.76
  4. Step 4: Simplify right side
    70,488.60x = 2,997,650,285.55
  5. Step 5: Solve for x
    x = 2,997,650,285.55/70,488.60
  6. Step 6: Final answer
    x = 42,526.74

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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.