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Finding the Fourth Proportional to 70,233.60, 105,328.80 and 20,318.40

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Solution

The fourth proportional to 70,233.60, 105,328.80 and 20,318.40 is: 30,471.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,233.60 : 105,328.80 = 20,318.40 : x
  2. Step 2: Convert to fraction form
    70,233.60/105,328.80 = 20,318.40/x
  3. Step 3: Cross multiply
    70,233.60x = 105,328.80 × 20,318.40
  4. Step 4: Simplify right side
    70,233.60x = 2,140,112,689.92
  5. Step 5: Solve for x
    x = 2,140,112,689.92/70,233.60
  6. Step 6: Final answer
    x = 30,471.35

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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.