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Finding the Fourth Proportional to 70,386.87, 105,590.60 and 20,460.47

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Solution

The fourth proportional to 70,386.87, 105,590.60 and 20,460.47 is: 30,693.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,386.87 : 105,590.60 = 20,460.47 : x
  2. Step 2: Convert to fraction form
    70,386.87/105,590.60 = 20,460.47/x
  3. Step 3: Cross multiply
    70,386.87x = 105,590.60 × 20,460.47
  4. Step 4: Simplify right side
    70,386.87x = 2,160,433,583.43
  5. Step 5: Solve for x
    x = 2,160,433,583.43/70,386.87
  6. Step 6: Final answer
    x = 30,693.70

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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.