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Finding the Fourth Proportional to 70,347.45, 105,526.64 and 20,428.37

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Solution

The fourth proportional to 70,347.45, 105,526.64 and 20,428.37 is: 30,644.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,347.45 : 105,526.64 = 20,428.37 : x
  2. Step 2: Convert to fraction form
    70,347.45/105,526.64 = 20,428.37/x
  3. Step 3: Cross multiply
    70,347.45x = 105,526.64 × 20,428.37
  4. Step 4: Simplify right side
    70,347.45x = 2,155,737,246.78
  5. Step 5: Solve for x
    x = 2,155,737,246.78/70,347.45
  6. Step 6: Final answer
    x = 30,644.14

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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.