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Finding the Fourth Proportional to 70,345.78, 105,518.67 and 21,097.78

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Solution

The fourth proportional to 70,345.78, 105,518.67 and 21,097.78 is: 31,646.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,345.78 : 105,518.67 = 21,097.78 : x
  2. Step 2: Convert to fraction form
    70,345.78/105,518.67 = 21,097.78/x
  3. Step 3: Cross multiply
    70,345.78x = 105,518.67 × 21,097.78
  4. Step 4: Simplify right side
    70,345.78x = 2,226,209,685.55
  5. Step 5: Solve for x
    x = 2,226,209,685.55/70,345.78
  6. Step 6: Final answer
    x = 31,646.67

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1.5x scale

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.