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Finding the Fourth Proportional to 30,643.20, 42,958.80 and 30,643.20

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Solution

The fourth proportional to 30,643.20, 42,958.80 and 30,643.20 is: 42,958.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,643.20 : 42,958.80 = 30,643.20 : x
  2. Step 2: Convert to fraction form
    30,643.20/42,958.80 = 30,643.20/x
  3. Step 3: Cross multiply
    30,643.20x = 42,958.80 × 30,643.20
  4. Step 4: Simplify right side
    30,643.20x = 1,316,395,100.16
  5. Step 5: Solve for x
    x = 1,316,395,100.16/30,643.20
  6. Step 6: Final answer
    x = 42,958.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.