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Finding the Fourth Proportional to 70,403.28, 105,599.64 and 20,483.76

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Solution

The fourth proportional to 70,403.28, 105,599.64 and 20,483.76 is: 30,724.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,403.28 : 105,599.64 = 20,483.76 : x
  2. Step 2: Convert to fraction form
    70,403.28/105,599.64 = 20,483.76/x
  3. Step 3: Cross multiply
    70,403.28x = 105,599.64 × 20,483.76
  4. Step 4: Simplify right side
    70,403.28x = 2,163,077,681.85
  5. Step 5: Solve for x
    x = 2,163,077,681.85/70,403.28
  6. Step 6: Final answer
    x = 30,724.10

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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.