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Finding the Fourth Proportional to 30,539.80, 45,809.70 and 21,208.60

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Solution

The fourth proportional to 30,539.80, 45,809.70 and 21,208.60 is: 31,812.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,539.80 : 45,809.70 = 21,208.60 : x
  2. Step 2: Convert to fraction form
    30,539.80/45,809.70 = 21,208.60/x
  3. Step 3: Cross multiply
    30,539.80x = 45,809.70 × 21,208.60
  4. Step 4: Simplify right side
    30,539.80x = 971,559,603.42
  5. Step 5: Solve for x
    x = 971,559,603.42/30,539.80
  6. Step 6: Final answer
    x = 31,812.90

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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.