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Finding the Fourth Proportional to 70,349.95, 105,530.42 and 20,430.87

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Solution

The fourth proportional to 70,349.95, 105,530.42 and 20,430.87 is: 30,647.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,349.95 : 105,530.42 = 20,430.87 : x
  2. Step 2: Convert to fraction form
    70,349.95/105,530.42 = 20,430.87/x
  3. Step 3: Cross multiply
    70,349.95x = 105,530.42 × 20,430.87
  4. Step 4: Simplify right side
    70,349.95x = 2,156,078,292.07
  5. Step 5: Solve for x
    x = 2,156,078,292.07/70,349.95
  6. Step 6: Final answer
    x = 30,647.90

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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.